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ReleaseNotes.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
dt { font-weight: bold; }
h3 { text-decoration: underline; }
dd { margin-top: 10px; margin-bottom: 10px; }
dd p { margin-top: 0; }
dd div { margin: 10px 0; }
</style>
<title>Wt Release notes</title>
</head>
<body>
<h1>Wt Release notes</h1>
This file lists important notes on migrating existing applications to
newer version of Wt. It lists changes in the library that may break
the way you build Wt, the way you configure Wt or the Wt API and
behaviour.
<h2>Release 4.7.0 (March 11, 2022)</h2>
<p>Wt 4.7.0 is a smaller release with no major new features to speak of, just some improvements and bug fixes here and there.</p>
<h3>Notable changes in default behavior</h3>
<p>These changes affect default behavior in Wt, and may require special attention:</p>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7434" target="_blank">Issue #7434</a>:
<a href="classWt_1_1WColor.html#a738c53d744ed38a448d1554f2a2f42cf">WColor::cssText()</a> now outputs
the color in <code>rgba</code> format by default.
It is now possible to set the opacity using such functions as
<a href="classWt_1_1WCssDecorationStyle.html#ac6bd2a8b86c8092fc437329dac09b302">WCssDecorationStyle::setBackgroundColor()</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8782" target="_blank">Issue #8782</a>:
When using drag/drop in combination with
<a href="classWt_1_1WStandardItemModel.html">WStandardItemModel</a>,
the item flags are now copied. Previously, after dragging an item one time
the <a href="group__modelview.html#gga1d77c4de293aebfacbdde124de06b8b0a08ab0b568328fb06a466be97d62f5649">ItemFlag::DragEnabled</a>
flag would be lost and the item would no longer be draggable.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9591" target="_blank">Issue #9591</a>:
<a href="https://www.webtoolkit.eu/wt/doc/reference/html/classWt_1_1Http_1_1Request.html#a970b7d266c6bead893ec6334520807bf">
Http::Request::urlScheme()
</a> now looks at <code>X-Forwarded-Proto</code> if Wt is behind a trusted reverse proxy.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9056" target="_blank">Issue #9056</a>:
There were memory leaks in <a href="classWt_1_1WFileDropWidget.html">WFileDropWidget</a>. This was fixed by changing the class to use
smart pointers for memory management. As a side effect,
<a href="classWt_1_1WFileDropWidget.html#a1dbb3d29cfc84797148cd2758d5c0f6b">WFileDropWidget::uploads()</a> now returns a copy instead of a const reference to the internal vector.
</li>
</ul>
<h3>Removals</h3>
<ul>
<li>
Since Google Maps v2 is no longer available as of May 26 2021, Wt no longer supports v2.
</li>
</ul>
<h3>Bug fixes</h3>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9562" target="_blank">Issue #9562</a>:
<ul>
<li>If a <a href="classWt_1_1Mail_1_1Message.html">Mail::Message</a> was sent more than once, the attachments would be empty after the first time.</li>
<li>Mails sent by <a href="namespaceWt_1_1Auth.html">Wt::Auth</a> are now logged using <a href="classWt_1_1WLogger.html">WLogger</a> instead of using <code>std::cout</code>.
As a result, the logging can also be disabled by adding <code>-info:Auth.AuthService</code> to <code><log-config></code> in <code><wt_config.xml></code>.</li>
</ul>
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9035" target="_blank">Issue #9035</a>:
The <code><head-matter></code> configuration option did not work with <code><script></code> elements without content (e.g. when using the <code>src</code> attribute).
The parser would always turn this into a self-closing tag, which is not allowed in HTML.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9271" target="_blank">Issue #9271</a>:
<a href="classWt_1_1Dbo_1_1backend_1_1MySQL.html">Dbo::backend::MySQL</a> now properly preserves the microsecond part of timestamps.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9264" target="_blank">Issue #9264</a>:
Added a remark to <a href="classWt_1_1WAbstractToggleButton.html#ae203379ba84c01935f68cd293f2a3eeb">WAbstractToggleButton::unChecked()</a> to clarify that it is not emitted
for <a href="classWt_1_1WRadioButton.html">WRadioButtons</a>.
</li>
</ul>
<h2>Release 4.6.3 (March 10, 2022)</h2>
<p>
Wt 4.6.3 is a patch release that addresses the following issues:
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9790" target="_blank">Issue #9790</a>:
A localized <a href="classWt_1_1WText.html">WText</a> with <a href="namespaceWt.html#a140dea437d52d3d7c438ea3bd16a1480">TextFormat::XHTML</a> was not refreshed properly when using arguments.
</li>
</ul>
</p>
<h2>Release 4.6.2 (February 15, 2022)</h2>
<p>
Wt 4.6.2 is a patch release that addresses the following issues:
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9424" target="_blank">Issue #9424</a>:
The special "no selection" status of
<a href="classWt_1_1WComboBox.html">WComboBox</a>
was lost if the items were rerendered, e.g. if the model changed.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9721" target="_blank">Issue #9721</a>:
Somewhere during the Bootstrap 5 transition, we accidentally removed some example code (<tt>pdfImageWrite.cpp</tt>) from the widget gallery.
We added it back.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9572" target="_blank">Issue #9572</a>:
Some JSON serialization tests were temporarily disabled since Boost 1.76.0, since the workaround put
in place does not generate entirely the same result.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9571" target="_blank">Issue #9571</a>:
Provided a fix for a false positive <tt>-Wfree-nonheap-object</tt> warning in <tt>Wt::Signals</tt>.
</li>
</ul>
</p>
<h2>Release 4.6.1 (December 23, 2021)</h2>
<p>
Wt 4.6.1 is a single bug fix release, fixing a regression
(<a href="https://redmine.webtoolkit.eu/issues/9523" target="_blank">issue #9523</a>).
A potential null pointer dereference would crash the Wt site or widget gallery every few days.
</p>
<h2>Release 4.6.0 (December 14, 2021)</h2>
<p>
We know that this one took a bit longer than normal. Starting now we intend to make the Wt release cycle
more regular, with a release every three months, so we're planning to release Wt 4.7.0 in March 2022.
We've still been busy improving Wt though. Wt 4.6.0 introduces some major new features, including
Bootstrap 5 theming support, Dbo-based forms, and SAML support for Wt::Auth.
</p>
<h3>Bootstrap 5 theming support (<a href="https://redmine.webtoolkit.eu/issues/7418" target="_blank">issue #7418</a>)</h3>
<p>
We split up <a href="classWt_1_1WBootstrapTheme.html">WBootstrapTheme</a> into
<a href="classWt_1_1WBootstrap2Theme.html">WBootstrap2Theme</a> and
<a href="classWt_1_1WBootstrap3Theme.html">WBootstrap3Theme</a>, and added
<a href="classWt_1_1WBootstrap5Theme.html">WBootstrap5Theme</a>. We found that the
different Bootstrap versions were distinct enough to warrant splitting each version of the theme up into its own class.
</p>
<p>
We abandoned development of <code>WBootstrap4Theme</code>, since there were still some unsolved
issues with it, and we didn't expect many users to be interested in it.
</p>
<p>
We also updated the design of the <a href="https://www.webtoolkit.eu/widgets" target="_blank">widget gallery</a>.
It now uses Bootstrap 5, and no longer uses box layouts, instead opting for a more responsive design featuring
a collapsible menu on narrow screens. This means that the widget gallery is finally usable on mobile phones!
</p>
<h3>Dbo-based forms (<a href="https://redmine.webtoolkit.eu/issues/8622" target="_blank">issue #8622</a>)</h3>
<p>
We added a new feature that allows Wt to automatically generate a form for a Dbo class. Based on the data types
that are used by the Dbo class, Wt will generate <a href="classWt_1_1Form_1_1WAbstractFormDelegate.html">form delegates</a>.
These form delegates are responsible for creating the widget and optional validator for representing the data type in the UI.
For example:
<a href="classWt_1_1WString.html">WString</a> objects are by default represented by a
<a href="classWt_1_1WLineEdit.html">WLineEdit</a>,
<a href="classWt_1_1WDate.html">WDate</a> objects by
<a href="classWt_1_1WDateEdit.html">WDateEdit</a>, and so on.
</p>
<p>
The user is able to override the default behavior either by customizing the
<a href="classWt_1_1Form_1_1Dbo_1_1FormView.html#aa60100980949a327483cec31c2963420">widgets</a> and/or
<a href="classWt_1_1Form_1_1Dbo_1_1FormView.html#a55cb4e6750f29a4871686d19cf714042">validators</a> or by creating a new
form delegate for the specific field and <a href="classWt_1_1Form_1_1Dbo_1_1FormView.html#a42cad48a1c44d319325be1732520ba83">adding</a>
it to the form.
</p>
<p>
All classes related to this new feature have been added to a new <a href="namespaceWt_1_1Form.html">Wt::Form</a> namespace.
Here's a short overview of the most important classes within that namespace:
</p>
<ul>
<li>
<a href="classWt_1_1Form_1_1Dbo_1_1FormModel.html">FormModel</a>: a model class that holds the data of the database object.
</li>
<li>
<a href="classWt_1_1Form_1_1Dbo_1_1FormView.html">FormView</a>: a view class to represent the database object in the UI.
</li>
<li>
<a href="classWt_1_1Form_1_1WAbstractFormDelegate.html">WAbstractFormDelegate</a>: delegate for creating form widgets.
</li>
</ul>
<p>We also added a new <a href="https://github.com/emweb/wt/tree/master/examples/dbo-form" target="_blank">example</a> to display this new functionality.</p>
<h3>SAML support for Wt::Auth (<a href="https://redmine.webtoolkit.eu/issues/8621" target="_blank">issue #8621</a>)</h3>
<p>
We added SAML support for authentication with third party identity providers.
<a href="classWt_1_1Auth_1_1Saml_1_1Service.html">Wt::Auth::Saml::Service</a>
implements a minimal SAML 2.0 service provider for single sign on.
</p>
<p>
We added a <a href="https://github.com/emweb/wt/tree/master/examples/feature/saml" target="_blank">SAML</a>
feature example to demonstrate this.
</p>
<p>
Note: this implementation is based on <a href="https://www.shibboleth.net/" target="_blank">Shibboleth</a>'s
OpenSAML library. This library uses the Apache License Version 2.0. Due to incompatibility with the GNU General
Public License V2.0 used by Wt, <strong>a commercial Wt license is required to distribute derived works using SAML
authentication</strong>.
</p>
<h3>Other features and improvements</h3>
<ul>
<li>
It is now possible to suspend the <a href="classWt_1_1WApplication.html">WApplication</a> using the
<a href="classWt_1_1WApplication.html#a5c811d91d3999ac881ce87bebaade864">suspend</a> function. Previously,
logging in using an external authentication provider required a popup, but this can now be done through a redirect
(<a href="classWt_1_1Auth_1_1OAuthService.html#a72f987f61e7a53636ac3f08b61bee2a5">OAuthService::setPopupEnabled()</a>
and
<a href="classWt_1_1Auth_1_1Saml_1_1Service.html#a89ae3fb932497cbe28ed8b032d447966">Saml::Service::setPopupEnabled()</a>).
This can also be useful for redirecting to payment providers.
(See <a href="https://redmine.webtoolkit.eu/issues/7742" target="_blank">issue #7742</a> and
<a href="https://redmine.webtoolkit.eu/issues/9439" target="_blank">issue #9439</a>.)</li>
<li>
Added <a href="classWt_1_1WServer.html#a28794f657a950e81c17e2c11fe4270b1">WServer::docRoot()</a>, which allows
access to the <code>--docroot</code> argument of wthttp.
(See <a href="https://redmine.webtoolkit.eu/issues/9391" target="_blank">issue #9391</a>.)
</li>
<li>
The Bootstrap themes now no longer need an active <a href="classWt_1_1WApplication.html">WApplication</a>
upon construction to properly function, through the addition of an <a href="classWt_1_1WTheme.html#ae15f579e5dfb0d50e909fd5e2c575f60">init()</a> function.
(See <a href="https://redmine.webtoolkit.eu/issues/9204" target="_blank">issue #9204</a>.)
</li>
<li>The <a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a> now allows drag/drop in between rows.
See <a href="classWt_1_1WAbstractItemView.html#a5469c23ea1e9066e98e832ec9da2af21">setEnabledDropLocations()</a>.
(See <a href="https://redmine.webtoolkit.eu/issues/8636" target="_blank">issue #8636</a>.)</li>
<li>With the latest version of Visual Studio supporting std::chrono's date and time zone support it is now possible
to use it when building Wt in C++20 mode
(<code>-DCMAKE_CXX_STANDARD=20 -DWT_CPP20_DATE_TZ_IMPLEMENTATION=std</code>). This means that when Wt is compiled
this way time zone support just works on Windows like it already did on Linux, instead of requiring you to
download the IANA time zone database.
(See <a href="https://redmine.webtoolkit.eu/issues/8595" target="_blank">issue #8595</a>.)</li>
<li>Updated the <code>date</code> library to commit <code>fb2554a7e00b24d23838b57a4db4121e148edb5c</code>.</li>
<li>Ability to change the row header count of <a href="classWt_1_1WTableView.html" target="_blank">WTableView</a>
after it is rendered (see <a href="https://redmine.webtoolkit.eu/issues/8077" target="_blank">issue #8077</a>).</li>
<li>Splitting up updates to stay under the form data limit when many updates are rapidly generated
(<a href="https://redmine.webtoolkit.eu/issues/7990" target="_blank">issue #7990</a>).</li>
<li>Revert delay of <a href="classWt_1_1WWidget.html#a1ee433705523b2b79c4c3539e0852c92">WWidget::load()</a>.
Load now happens when a widget is added to the widget tree.
(See <a href="https://redmine.webtoolkit.eu/issues/7968" target="_blank">issue #7968</a>.)</li>
<li>Added option to not automatically select first suggestion of a
<a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a>.</li>
<li><a href="classWt_1_1Http_1_1Request.html#ad8a1199b8692854fefb76f494d793f93">Wt::Http::Request::hostName()</a>
now takes into account <code>X-Forwarded-Host</code>.</li>
<li>Updated the version of the included <code>SQLite</code> to version 3.35.5.</li>
<li>Added <code>doc/licenses.md</code> as an exhaustive list of the licenses used by Wt, source code from external
sources included in Wt and any external dependencies.</li>
</ul>
<h3>Bug fixes</h3>
<ul>
<li><a href="https://redmine.webtoolkit.eu/issues/8972" target="_blank">Issue #8972</a>: fixed a regression with
<a href="classWt_1_1WResource.html#a06bb9dbe3ae195c320cfed7b062d448a">WResource::setInternalPath()</a>.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8838" target="_blank">Issue #8838</a>:
<a href="classWt_1_1WIOService.html">WIOService</a> would block all signals in its worker threads. Now we let through
thread specific signals, so that signal handlers for them can be installed, e.g. by crashpad.
</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8720" target="_blank">Issue #8720</a>:
fixed
<a href="classWt_1_1WServer.html#aa47d7a7af63b11ae5c49ea226401b5fa">WServer::dedicatedSessionProcess()</a>
so it's accurate after
<a href="classWt_1_1WServer.html#a6ef2c780a70eebc68707ea0d684b8509">WServer::setServerConfiguration()</a>.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8531" target="_blank">Issue #8531</a>:
fixed deletion/modification of remember me cookie when using websockets.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8518" target="_blank">Issue #8518</a>: fixed accessing freed memory
when <a href="classWt_1_1Dbo_1_1ptr.html">Wt::Dbo::ptr</a> exits at destruction of its session.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8392" target="_blank">Issue #8392</a>: fixed crash when using
<a href="classWt_1_1WToolBar.html#af18dca00ce4fb782c806272b6dfc1659">WToolBar::widget()</a>.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8336" target="_blank">Issue #8336</a>: fixed
<a href="classWt_1_1WNavigationBar.html">WNavigationBar</a> regression: popup menu remains selected.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8164" target="_blank">Issue #8164</a>: added protected copy
constructor to <a href="classWt_1_1WStandardItem.html">WStandardItem</a> to allow easier overriding of
<a href="classWt_1_1WStandardItem.html#a41a5f22630a4c876e3a4ba822c43a744">WStandardItem::clone()</a>.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8135" target="_blank">Issue #8135</a>:
<a href="classWt_1_1WMenu.html">WMenu</a> submenu selection not proparly propagated.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8025" target="_blank">Issue #8025</a>: text clipped in
<a href="classWt_1_1WRasterImage.html">WRasterImage</a> (GraphicsMagick) with Pango.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/7811" target="_blank">Issue #7811</a>: invalid ackId.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/7975" target="_blank">Issue #7975</a>: drag-drop icon under dialog.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8597" target="_blank">Issue #8597</a>: taking UpdateLock in
<a href="classWt_1_1WResource.html">WResource</a> sometimes fails.</li>
<li><a href="https://redmine.webtoolkit.eu/issues/8838" target="_blank">Issue #8838</a>: breakpad/crashpad signal
handler doesn't work in <a href="classWt_1_1WIOService.html">WIOService</a> threads.</li>
<li>Fixed <a href="classWt_1_1WString.html#a233225f344af1b4a090f4a4dd76ec53d">WString::empty()</a> returning false
for <code>Wt::WString("{1}").arg("")</code>.</li>
</ul>
<h2>Release 4.5.2 (December 14, 2021)</h2>
<p>Wt 4.5.2 is a bugfix release containing the following changes:</p>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9490" target="_blank">Issue #9490</a>: Fixed a possible
exception being thrown in the Postgres backend for Dbo when subnormal floating point numbers are retrieved
from the database.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9414" target="_blank">Issue #9414</a>: Fixed an error that
occurred when trying to link <code>libwtdbosqlite3</code> on Fedora 35.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9363" target="_blank">Issue #9363</a>: Added a workaround for
<a href="https://github.com/boostorg/spirit/issues/688" target="_blank">Boost Spirit issue #688</a>,
affecting versions of Boost >e; 1.66.0.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9270" target="_blank">Issue #9270</a>: Fixed a possible but
very rarely occurring race condition
in the generation of ids that would make it possible to have two widgets with the same id in the same
<a href="classWt_1_1WApplication.html">WApplication</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9230" target="_blank">Issue #9230</a>: Fixed an issue where the 3-argument version
of <a href="classWt_1_1Dbo_1_1QueryModel.html#ac225ba823673dc46e47811631e3218fe">QueryModel::setHeaderData</a>
was no longer accessible.
</li>
</ul>
<h2>Release 4.5.1 (October 7, 2021)</h2>
<p>Wt 4.5.1 is a bugfix release containing the following changes:</p>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/9008" target="_blank">Issue #9008</a>:
Fixed possible JavaScript issues by appending a semicolon to all JavaScript statements when using
<a href="classWt_1_1WApplication.html#a2a92457b9212cef4057cb54e56183967">doJavaScript</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8964" target="_blank">Issue #8964</a>:
fixed Boost 1.77.0 compilation by modernizing the implementation of <code>WCssParser</code> to use
range-based for loops instead of <code>BOOST_FOREACH</code>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8677" target="_blank">Issue #8677</a>:
<a href="classWt_1_1WWidget.html#a5d403e0390841df77a23445b28044d5d">WWidget::setScrollVisibilityEnabled()</a>
now refers to the correct
<a href="https://github.com/emweb/wt/tree/master/examples/feature/scrollvisibility" target="_blank">scrollvisibility</a> example.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8577" target="_blank">Issue #8577</a>:
fixed some tests in <code>test.http</code> related to the handling of
<code>X-Forwarded-For</code> and <code>Client-IP</code> headers.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8467" target="_blank">Issue #8467</a>:
fixed compilation of <code>WTextRenderer.C</code> on some systems due to a missing <code>#include <limits></code>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8407" target="_blank">Issue #8407</a>:
fixed an issue in <a href="classWt_1_1WTreeView.html">WTreeView</a> where the expand icon was not removed
when removing the last child.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8376" target="_blank">Issue #8376</a>:
made dragging and dropping icons work correctly in
<a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a> by
preventing the default action.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8335" target="_blank">Issue #8335</a>:
fixed an issue where
<a href="classWt_1_1WWidget.html#af432588db3d599f89b54121f2ede8d63">WWidget::layoutSizeChanged()</a> would
sometimes not be called.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8305" target="_blank">Issue #8305</a>:
fixed an issue that caused the
<a href="https://github.com/emweb/wt/tree/master/examples/style" target="_blank">style example</a>
to segfault.
<a href="classWt_1_1WRasterImage.html#a75dffbb4731d33ac6a2dc2fb8e9a4aec">WRasterImage::setChanged()</a> could
cause a crash if the image was not meant to be exposed as a resource.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8202" target="_blank">Issue #8202</a>:
fixed an issue where
<a href="classWt_1_1WServer.html#afd61307d5d869cfecea239dac720a86d">WServer::postAll()</a>
would also be handled by sessions that were not fully complete yet, which meant that
<a href="classWt_1_1WApplication.html#a38d922da0a0d83395519f3eaab85d0f6">WApplication::instance()</a>
would return <code>nullptr</code>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8194" target="_blank">Issue #8194</a>:
fixed an issue where
<a href="classWt_1_1WVirtualImage.html">WVirtualImage</a> would break if you added a
<a href="classWt_1_1WInteractWidget.html#a40c3643603fa861b1ec797eec794aa4c">mouseMoved()</a> handler to images.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8114" target="_blank">Issue #8114</a>:
fixed a possible JavaScript error in <a href="classWt_1_1WCanvasPaintDevice.html">WCanvasPaintDevice</a>
if an image load handler was executed after the painted widget was already removed.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8041" target="_blank">Issue #8041</a>:
fixed an inconsistency in how ellipses were rendered when using
<a href="classWt_1_1WPainter.html#aa79220ed9456f67a393009e5c5eea27e">drawArc()</a> with
wide <a href="classWt_1_1WPen.html">WPen</a> on an HTML canvas.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8039" target="_blank">Issue #8039</a>:
<a href="classWt_1_1WLocalDateTime.html#a08aaccd32fd329f4f696b07a060bcca1">WLocalDateTime::timeZoneOffset()</a> now throws if it was initialized without timezone
information, as opposed to crashing.
The <a href="https://github.com/emweb/wt/tree/master/examples/filetreetable" target="_blank">filetreetable example</a> was changed to use UTC so we don't need
timezones.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7998" target="_blank">Issue #7998</a>:
made sure the scroll position is preserved when a <a href="classWt_1_1WTreeView.html">WTreeView</a>
is sorted.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7996" target="_blank">Issue #7996</a>:
clarified the documentation of <a href="classWt_1_1WInteractWidget.html#ae11e050cce0d4a8f742afa3ef92bfe8c">WInteractWidget::clicked()</a>
to note that middle clicks do not emit the clicked event.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7985" target="_blank">Issue #7985</a>:
re-exposed two argument version of
<a href="classWt_1_1WAbstractItemModel.html#a0bccbb4373b4c1e8bce85573b933d53d">WAbstractItemModel::setHeaderData()</a>
in <a href="classWt_1_1Dbo_1_1QueryModel.html">QueryModel</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7957" target="_blank">Issue #7957</a>:
fixed behind reverse proxy behavior when using dedicated process mode.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7912" target="_blank">Issue #7912</a>:
fixed JavaScript errors when using <a href="classWt_1_1WPopupMenu.html">WPopupMenu</a>
in <a href="namespaceWt.html#af4b6ed5fd28b4f5fa141b153c1107349accf2281a355c2c9cd4698ac30bea7820">WidgetSet</a>
mode.
</li>
<li>
Added warning to the <a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a> documentation: this widget should not be bound to a template.
</li>
<li>
Added missing virtual destructor to <a href="classWt_1_1WLogSink.html">WLogSink</a> (contributed by Pavlo Solntsev).
</li>
<li>
Fixed an issue where the
<a href="classWt_1_1WWidget.html#aa5ce605dd465e06f3e3c2dbce2a4098e">scrollVisibilityChanged()</a>
signal would not always be created.
</li>
<li>
Fixed a compilation issue on Windows with the latest MSVC and Boost in
<code>WebUtils.C</code>.
</li>
<li>
Various fixes to make Wt build properly with C++20:
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7002" target="_blank">Issue #7002</a>:
made tests build with the new <code>char8_t</code> type.
</li>
<li>
Fixed infinite recursion in <a href="classWt_1_1WString.html">WString</a> comparison operator.
</li>
<li>
Fixed compilation of <a href="classWt_1_1Dbo_1_1Transaction.html">Dbo::Transaction</a> due
to the removal of <code>uncaught_exception</code>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/8022" target="_blank">Issue #8022</a>:
fixed a compilation issue due to ambiguous <code>local_time</code> symbol with MSVC when using
<code>/std:c++latest</code>.
</li>
</ul>
</li>
<li>
Contributions by Steven Köhler:
<ul>
<li>Fixed a "size is not a function" issue when using jQuery 3.x</li>
<li>Fixed a warning when using <code>DBO_EXTERN_TEMPLATES</code> and <code>DBO_INSTANTIATE_TEMPLATES</code>.</li>
<li>Resolved C++17 <code>std::iterator</code> deprecation issue in <code>Wt::Dbo</code>.</li>
<li>Fixed an access violation in <code>Dbo::collection<C>::iterator</code>.</li>
<li>Added the missing function definition for <code>Dbo::collection<C>::const_iterator::operator=</code>.</li>
<li>Resolved/suppressed some type conversion warnings in <a href="classWt_1_1Dbo_1_1collection.html">Dbo::collection</a>.</li>
</ul>
</li>
</ul>
<h2>Release 4.5.0 (December 15, 2020)</h2>
<h3>Notable changes</h3>
<ul>
<li>Wt now targets C++14, and <tt>CMAKE_CXX_STANDARD</tt> defaults to "14". There appears to
be no good reason to maintain C++11 support, since every compiler that supports enough C++11
for Wt also supports enough C++14. You should still be able to use C++11 mode when using Wt
as a library, but Wt itself no longer builds in C++11 mode.</li>
<li>Wt::Dbo: the <a href="classWt_1_1Dbo_1_1backend_1_1Firebird.html">Firebird</a> backend
has been marked as unmaintained. The Firebird tests were not succeeding, likely because
of an incompatibility with the unmaintained IBPP that the Firebird backend is based on
and recent versions of Firebird.</li>
</ul>
<h3>Features and improvements</h3>
<ul>
<li><a href="https://redmine.webtoolkit.eu/issues/7586" target="_blank">Issue #7586</a>:
The <tt><behind-reverse-proxy></tt> option has been deprecated in favor of a new
<tt><trusted-proxy-config></tt> option. It's now possible to specify the IP header
that Wt should look for using <tt><remote-ip-header></tt> (defaults to <tt>X-Forwarded-For</tt>).
Wt will trust all proxies listed in <tt><trusted-proxies></tt>.
When <tt><behind-reverse-proxy></tt> is set to <tt>true</tt>, the behavior stays the
same as it was before. <a href="overview.html#config_general">See the library overview for more
information about this option.</a>
</li>
<li>
<a href="classWt_1_1WFormModel.html">WFormModel</a> now uses string comparison instead of pointer comparison
for its fields.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7666" target="_blank">Issue #7666</a>: In some cases Wt 4.4.0 would
connect <tt>jsScrollVisibilityChanged</tt> even if it was not actually being used, causing extra unnecessary
requests.
</li>
<li>
Added Jenkins pipelines in the
<tt><a href="https://github.com/emweb/wt/tree/master/jenkins" target="_blank">jenkins</a></tt> folder.
We use Jenkins to test Wt at Emweb but we would usually
keep this configuration in Jenkins. Our pipelines for Linux and FreeBSD have now been updated a bit and moved
into the Wt repository, since they may be of use to people looking to contribute to Wt.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7669" target="_blank">Issue #7669</a>: Wt now automatically uses
<a href="classWt_1_1WObject.html#a3de0f0baf35f42aa4e77a90d427f2e11">addChild</a> instead of
<a href="classWt_1_1WContainerWidget.html#ad17b653b6f0487e42b2a63ab9de03f20">addWidget</a> when
<a href="classWt_1_1WContainerWidget.html#acf75dda5024db05cf847c282f8a99117">addNew</a> is used
on a global widget, like <a href="classWt_1_1WPopupWidget.html">WPopupWidget</a>.
</li>
</ul>
<h3>Bug fixes</h3>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/6367" target="_blank">Issue #6367</a>:
fixed issue where wthttp would no longer accept new connections when an error occurred
while accepting a connection, e.g. if the open file limit was reached.
</li>
<li>
<a href="classWt_1_1WDate.html#a57a614e3408f39c70605027fe3e3f3f5">WDate::currentServerDate()</a> and
<a href="classWt_1_1WTime.html#a271bd124707e50cc15872e263ffa71f2">WTime::currentServerTime()</a> now
correctly return the local date and time on the server instead of UTC.
</li>
<li>
Fixed visibility of
<a href="classWt_1_1Auth_1_1OAuthProcess.html">OAuthProcess</a> and
<a href="classWt_1_1Auth_1_1OAuthAccessToken.html">OAuthAccessToken</a>.
</li>
<li>Fixed issues
<a href="https://redmine.webtoolkit.eu/issues/6548" target="_blank">#6548</a> and
<a href="https://redmine.webtoolkit.eu/issues/7749" target="_blank">#7749</a>:
URL parameters were being parsed more than once for file uploads, causing a rapid
accumulation of duplicate values during uploads, and potentially causing segmentation
faults. The
<a href="https://github.com/emweb/wt/tree/master/examples/wtwithqt" target="_blank">wtwithqt</a>
example was also updated so that it properly waits for condition variables in a loop,
to deal with spurious wakeups. Also fixed a potential use-after-free when updating resource
progress.
</li>
<li>
Fixed an issue where the <a href="classWt_1_1Http_1_1Client.html">HTTP Client</a>
would wait indefinitely for data when <tt>Content-Length</tt> is zero.
</li>
<li>
WebSockets: If a bad value for <tt>server_max_window_bits</tt> or
<tt>client_max_window_bits</tt> was encountered, this would cause
an uncaught exception and a crash. This is now handled properly.
</li>
<li>
Fixed issue with <tt>DISTINCT ON</tt> in X3 based query parser: the fields listed
there would incorrectly be regarded as fields being returned.
</li>
<li>
Fixed issue <a href="https://redmine.webtoolkit.eu/issues/7677" target="_blank">#7677</a>:
when a font could not be loaded in <a href="classWt_1_1WPdfImage.html">WPdfImage</a>,
this would throw an uncaught exception. This was changed to logging an error.
</li>
<li>
Fixed issue <a href="https://redmine.webtoolkit.eu/issues/7719" target="_blank">#7719</a>:
<a href="group__modelview.html#gaac976f394f370d3d62c29791b13a0049">Wt::asString</a>
did not properly handle <tt>unsigned long</tt>.
</li>
<li>
<a href="https://github.com/emweb/wt/pull/166" target="_blank">PR #166</a>:
fixed <a href="https://github.com/emweb/wt/tree/master/examples/mandelbrot" target="_blank">mandelbrot</a> example:
missing call to <a href="classWt_1_1WRasterImage.html#af06beb3b09289d373fb7855750afdc83">done()</a>.
</li>
<li>
<a href="https://github.com/emweb/wt/pull/167" target="_blank">PR #167</a>:
we need to link with Boost unit_test_framework on Windows when <tt>BOOST_DYNAMIC</tt> is <tt>ON</tt>.
</li>
<li>
Fixed an issue where <a href="classWt_1_1WMediaPlayer.html">WMediaPlayer</a> would not get properly
loaded when <tt>reload-is-new-session</tt> is <tt>false</tt>, and the page is refreshed.
</li>
</ul>
<h2>Release 4.4.0 (August 3, 2020)</h2>
<p>Wt 4.4.0 adds a couple of new features, like multiple X axes, and WColorPicker, among other fixes and tweaks.</p>
<h3>Security related</h3>
<p>
Wt now rejects GET requests for Ajax-enabled sessions that are not for resources, as an
extra means to prevent session hijacking attempts. Patch provided by Bruce Toll in
<a href="https://redmine.webtoolkit.eu/issues/7585" target="_blank">issue #7585</a>.
</p>
<h3>Major new features</h3>
<ul>
<li>
<a href="classWt_1_1Chart_1_1WCartesianChart.html">WCartesianChart</a>: similar to how
Wt 4.0.4 added support for multiple Y axes, Wt 4.4.0 adds support for multiple X axes,
too. Instead of trying to squeeze another <tt>int</tt> argument into functions like
<a href="classWt_1_1Chart_1_1WCartesianChart.html#a37b22e4bdc17c45d193848cca443dd28">WCartesianChart::map</a>,
we decided to add overloads that take two <a href="classWt_1_1Chart_1_1WAxis.html">WAxis</a> references.
</li>
<li>
Added <a href="classWt_1_1WColorPicker.html">WColorPicker</a>: a simple form widget that display a browser-native
color picker. Patch provided in <a href="https://github.com/emweb/wt/pull/158" target="_blank">PR #158</a>.
</li>
</ul>
<h3>Minor features</h3>
<ul>
<li>
Wt::Dbo:
<ul>
<li>
<a href="https://github.com/emweb/wt/pull/161" target="_blank">PR #161</a>: added support for
<a href="group__dbo.html#ga4987bb75aacce8ada8662cc86a6fc3b5"><tt>ON UPDATE RESTRICT</tt></a> and
<a href="group__dbo.html#gaae0942000fa56b27ca4185f76395c388">ON DELETE RESTRICT</a> foreign key constraints in Wt::Dbo.
</li>
<li>
<tt>DBO_INSTANTIATE_TEMPLATES</tt> and the <tt>DBO_EXTERN_TEMPLATES</tt> macros used to be disabled with
Visual Studio since they wouldn't work with old versions of Visual Studio. We reenabled those macros, since
they've been working for a while now.
</li>
<li>
Added <a href="classWt_1_1Dbo_1_1Query.html#a693ed2ff14acaeffe45b8b6c09b6da8f">orWhere</a>.
</li>
</ul>
</li>
<li>
<a href="classWt_1_1WFileResource.html">WFileResource</a>: added a log message when failing to open a file. Previously,
it would not be very clear why nothing was downloaded.
</li>
<li>
Added the MIME type for <tt>.txt</tt> files to <tt>wthttp</tt>, so that
they are displayed in the browser rather than prompt a download.
</li>
<li>
All of the properties that Wt uses are now listed in the default <tt>wt_config.xml</tt> to make it easier
to get an overview of all of them without having to find them in the reference documentation.
</li>
</ul>
<h3>Updates</h3>
<ul>
<li>
<a href="https://github.com/emweb/wt/pull/162" target="_blank">PR #162</a>: Updated included Bootstrap 3 version to 3.4.1 (from 3.3.7)
</li>
</ul>
<h3>Bug fixes</h3>
<ul>
<li>
Wt:: Auth:
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7518" target="_blank">Issue #7518</a>: previously, it was
not possible to set
<a href="classWt_1_1Auth_1_1AbstractPasswordService_1_1AbstractStrengthValidator.html">AbstractStrengthValidator</a>
to non-mandatory. This has now been fixed. It now also correctly reports
<a href="namespaceWt.html#a06744b1cf5fdeae2a8a6c0d0084fdf25">InvalidEmpty</a> when the input is left empty.
</li>
<li>
Fixed an issue where slots connected to <a href="classWt_1_1Auth_1_1Login.html#aafb1d791aeee8b59d28faeda88e8392b">Login::changed()</a> would still have the old session id, which would afterwards be updated, causing resource urls created in the slot to have the wrong session id.
</li>
</ul>
</li>
<li>
<a href="classWt_1_1WPaintedWidget.html">WPaintedWidget</a>: fixed an issue where combining incremental painting (<a href="namespaceWt.html#a23a1002020ee93ed4679d351b7350de3">PaintFlag::Update</a>) with images could cause the first paint event to be discarded, resulting in an incomplete result.
</li>
<li>
Previously, having multiple instances of <a href="classWt_1_1WGoogleMap.html">WGoogleMap</a> could cause JavaScript errors. This has now been resolved.
</li>
</ul>
<h2>Release 4.3.1 (April 20, 2020)</h2>
<p>This release fixes the following issues:</p>
<ul>
<li>
<a href="classWt_1_1WWebWidget.html">WWebWidget:</a> moved <tt>id_</tt> out of <tt>OtherImpl</tt>:
this fixes issues caused by the <tt>id_</tt> being removed before other things that depend on it,
like the <tt>jsScrollVisibilityChanged_</tt> signal. Fixes
<a href="https://redmine.webtoolkit.eu/issues/7508" target="_blank">issue #7508</a>.
</li>
<li>
Fixed join information not being copied over when copying
<a href="classWt_1_1Dbo_1_1AbstractQuery.html">Wt::Dbo::AbstractQuery</a>.
</li>
<li>
MinGW fixes: Direct2D/DirectWrite were disabled and are now enabled
by default. Libraries were changed to lowercase for cross-compiling
from Linux. Windows is case-insensitive, and MinGW libraries on Linux
are lowercase.
Fixes <a href="https://redmine.webtoolkit.eu/issues/7505" target="_blank">issue #7505</a>.
</li>
<li>
Fixed a wrong documentation link in the widget gallery.
</li>
</ul>
<h2>Release 4.3.0 (March 26, 2020)</h2>
<p>Wt 4.3.0 mainly adds the ability to redirect logging to a custom logging function, and login and transport encryption to the mail client, among some other fixes and tweaks.</p>
<h3>Logging redirection (<a href="https://redmine.webtoolkit.eu/issues/7240" target="_blank">issue #7240</a>)</h3>
<p>
Before, it was possible to send logging to a file or an <tt>std::ostream</tt>, and configure which messages were logged in <tt>wt_config.xml</tt>. Wt 4.3.0 extends
this with the ability to send all logging to a function, allowing users to redirect Wt's logs to whathever logging framework they prefer to use.
</p>
<p>The few log messages coming from Wt::Dbo would always be logged to <tt>std::cerr</tt>. It is now possible to change this to use Wt's logger, or a custom log function.</p>
<p>To allow for this new functionality, we introduced an abstract <a href="classWt_1_1WLogSink.html">WLogSink</a> class, and the following functions:</p>
<ul>
<li><a href="classWt_1_1WServer.html#a45fdbea913a16a310e10e337e5933072">WServer::setCustomLogger()</a>: sets a custom logger on the WServer level</li>
<li><a href="namespaceWt_1_1Dbo.html#a9a326a13084b93cbb33bf1c470879b0d">Wt::Dbo::setCustomLogger()</a>: sets a custom logger globally for all of Wt::Dbo</li>
<li><a href="namespaceWt_1_1Dbo.html#ac1c13200d17c21ab7a8dfe4cbf3aed05">Wt::Dbo::logToWt()</a>: sends all of Wt::Dbo's logging to Wt's logger</li>
</ul>
<h3>Mail client: support for login and encryption (<a href="https://redmine.webtoolkit.eu/issues/7444" target="_blank">issue #7444</a>)</h3>
<p>
We added basic support for <a href="namespaceWt_1_1Mail.html#a2e673920327e6df099fe3ec0191fdc93a4cd8413207629a963225f4314b53adcd">PLAIN</a> and
<a href="namespaceWt_1_1Mail.html#a2e673920327e6df099fe3ec0191fdc93a99dea78007133396a7b8ed70578ac6ae">LOGIN</a> authentication methods, and
encryption using <a href="namespaceWt_1_1Mail.html#a55d819f240a3553f33e6416ecd05b91fafa91df952500d196f6a10117d98843fe">StartTLS</a> or just
simple <a href="namespaceWt_1_1Mail.html#a55d819f240a3553f33e6416ecd05b91fa099d7d04319e5191b7473e016c55e320">TLS</a>.
</p>
<p>
You can enable authentication with <a href="classWt_1_1Mail_1_1Client.html#a4861b5d0157663d803a3edcb97f651f4">Client::enableAuthentication()</a>, and encryption with
<a href="classWt_1_1Mail_1_1Client.html#a170288f392a84a1e4e560422843c9a74">Client::setTransportEncryption()</a>, or using the configuration properties <tt>smtp-auth-username</tt>, <tt>smtp-auth-password</tt>,
<tt>smtp-auth-method</tt>, and <tt>smtp-transport-encryption</tt>.
</p>
<h3>Other changes</h3>
<p>Some small changes in behaviour that you may want to be aware of:</p>
<ul>
<li>
Wt::Auth: lost password tokens used to be removed as soon as the link was used, even when they were not actually used to change the password. Now, the
token will stay valid until the password is actually changed. Also, if the password is changed through other means, the update password token is invalidated.
</li>
<li>
<a href="classWt_1_1WCanvasPaintDevice.html">WCanvasPaintDevice</a>: instead of stopping the drawing entirely when <tt>drawImage()</tt> fails (e.g. because of a missing image),
the image will be skipped but drawing will continue. An error will be logged to the console.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7060" target="_blank">Issue #7060</a>: fixed
<a href="classWt_1_1Http_1_1Request.html#a5f18be4100482713c257bea43a3c913b">Request::clientAddress()</a> when behind a reverse proxy to
be the same as <a href="classWt_1_1WEnvironment.html#aedad4a59684dc41c9985a713ee4eb00a">WEnvironment::clientAddress()</a>, and as mentioned in the documentation.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7404" target="_blank">Issue #7404</a>: reparenting of popup widgets should only stop at scroll bars.
</li>
</ul>
<p>Other changes and fixes:</p>
<ul>
<li>
<a href="classWt_1_1WLength.html">WLength</a>: added
<a href="namespaceWt.html#a736803866293d189d852d2c7adb7d94ea67bbbcb8c3f0869b19682f3dd5f27893">LengthUnit::ViewportWidth</a>,
<a href="namespaceWt.html#a736803866293d189d852d2c7adb7d94ea1cc83e088aae799b9acb909c10c3d8b2">LengthUnit::ViewportHeight</a>,
<a href="namespaceWt.html#a736803866293d189d852d2c7adb7d94eae21d04628175a77110405adc9338b9c2">LengthUnit::ViewportMin</a>,
and <a href="namespaceWt.html#a736803866293d189d852d2c7adb7d94ea91b2f19f5c34f05a401200359e38e3c3">LengthUnit::ViewportMax</a>.
</li>
<li>
Updated the <tt>composer</tt> and <tt>filetreetable</tt> examples to use <a href="classWt_1_1WLocalDateTime.html">WLocalDateTime</a> rather than OS specific functions.
</li>
<li>
Refactored the <tt>treelist</tt> example.
</li>
<li>
Wt::Dbo:
<ul>
<li>added query parsing implementation based on X3 instead of Spirit Qi, which reduces compile time and memory usage.</li>
</ul>
<ul>
<li>added <a href="classWt_1_1Dbo_1_1SqlStatement.html#a4868a3639566171ac3d58e15e3bf77f3">SqlStatement::columnCount()</a>. This
makes it possible to create <tt>query_result_traits</tt> for result types with a variable number of columns, like <tt>std::vector</tt>.</li>
</ul>
</li>
<li>
<a href="classWt_1_1WModelIndex.html">WModelIndex</a> now has a proper ordering, even for raw indexes. This means they can properly be inserted into and retrieved from a <tt>std::set</tt>.
</li>
<li>
<a href="classWt_1_1WServer.html">WServer</a>: documented the <a href="classWt_1_1WServer.html#a5f850e30f9bd54a946c3f832d60f5b2a">schedule()</a> function.
</li>
<li>
wthttp: added child process id to some of the logging related to dedicated session processes
</li>
</ul>
<h2>Release 4.2.2 (March 16, 2020)</h2>
<p>
This release fixes the following issues:
</p>
<ul>
<li>
Security-related: in Wt::Auth the lost password email would be sent to the email
address provided in the form, rather than the user's configured email address. While
we treat email addresses as case insensitive, it is possible that the mail server may not,
and that could potentially be used to steal an account. It is however quite rare for
email services to be case sensitive.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7439" target="_blank">Issue #7439</a>:
ensure that tooltips are always on top, even inside of a dialog.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7448" target="_blank">Issue #7448</a>:
fixed compilation error on recent versions of MinGW, by using the <tt>gmtime_s</tt>
function on Windows.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7447" target="_blank">Issue #7447</a>:
fixed text format being reset when the text of a <a href="classWt_1_1WAnchor.html">WAnchor</a> is cleared.
</li>
<li>
Fix for <a href="classWt_1_1WLeafletMap.html">WLeafletMap</a> issue that was <a href="https://redmine.emweb.be/boards/2/topics/16718" target="_blank">reported on the forum</a>: signals would get unexposed when options were changed.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7457" target="_blank">Issue #7457</a>:
moved call to <a href="classWt_1_1WApplication.html#ae88546224ed32cade783da188b145138">WApplication::require()</a> to the constructor, since calling it in the render function may cause issues.
</li>
<li>
Fixes for <a href="classWt_1_1WVirtualImage.html">WVirtualImage</a>:
<ul>
<li>Do not render zero width or zero height images. This was possible when <tt>imageWidth</tt> or <tt>imageHeight</tt> was
a multiple of the <tt>gridImageSize</tt>.</li>
<li>Fixed <a href="classWt_1_1WVirtualImage.html#a0feb746fc22b907f779423bd9768109c">scrollTo()</a> when the image is narrower than the viewport: <tt>scrollTo(0, 0)</tt> would not put <tt>(0, 0)</tt> at
the top left when the image was narrower (or taller) than the viewport.</li>
</ul>
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7480" target="_blank">Issue #7480</a>: prefix Wt's crypt functions to fix issues
when linking with <tt>libxcrypt</tt>, and also set C code's default visibility to hidden.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7468" target="_blank">Issue #7468</a>: fixed panning not working properly for a <a href="classWt_1_1Chart_1_1WCartesianChart.html">WCartesianChart</a> with plain tooltips.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7482" target="_blank">Issue #7482</a>: <tt>lastId_</tt> in Postgres backend should be <tt>long long</tt>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/6774" target="_blank">Issue #6774</a>: misc. <a href="classWt_1_1WTreeView.html">WTreeView</a> fixes.
</li>
<li>
Fixed use after free caused by order of destruction in <a href="classWt_1_1WWebWidget.html">WWebWidget</a> destructor.
</li>
</ul>
<h2>Release 4.2.1 (February 6, 2020)</h2>
<p>
This release fixes the following issues:
</p>
<ul>
<li>wthttp fixes:
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7406" target="_blank">Issue #7406</a>: requests for absolute-form URLs (e.g. <tt>GET http://localhost:8080/ HTTP/1.1</tt> instead of <tt>GET / HTTP/1.1</tt>) are now rejected. No client normally sends requests like this to an origin server. See <a href="https://tools.ietf.org/html/rfc7230#section-5.3.2" target="_blank">RFC 7230, section 5.3.2</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7405" target="_blank">Issue #7405</a>: multiline HTTP headers (line folding) were causing
wthttp to segfault. This was fixed by removing support for (obsolete) line folding. See <a href="https://tools.ietf.org/html/rfc7230#section-3.2.4" target="_blank">RFC 7230, section 3.2.4</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7390" target="_blank">Issue #7390</a>: added MIME type for <tt>.wasm</tt> files.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7384" target="_blank">Issue #7384</a>: setting the <tt>--docroot</tt> of wthttp
to <tt>.;</tt> will now correctly make it so that no path is interpreted as being a static resource.
</li>
</ul>
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7350" target="_blank">Issue #7350</a>: fixed <a href="classWt_1_1WPaintedWidget.html">WPaintedWidget</a>'s <tt>wtResize</tt> JavaScript to assume its preferred size when called with a size of -1.
</li>
<li>
Fixed possible JavaScript errors caused by <a href="classWt_1_1WContainerWidget.html">WContainerWidget</a>'s <tt>wtEncodeValue</tt> JavaScript not being terminated by a semicolon.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7407" target="_blank">Issue #7407</a>: fixed JavaScript memory leak related to deferred or HTML tooltips.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7360" target="_blank">Issue #7360</a>: documented <a href="structWt_1_1Mail_1_1Message_1_1Recipient.html">Wt::Mail::Message::Recipient</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7393" target="_blank">Issue #7393</a>: if the internal path is set to invalid in initialize, Wt should still send a 404 status code.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7361" target="_blank">Issue #7361</a>: a previous attempt at fixing horizontal scrolling stutter
in Wt 4.1.1 caused a regression in <a href="classWt_1_1WTableView.html#a093b661f93551c1d6f73c423ae8ef459">WTableView::scrollTo()</a>.
</li>
<li>
Fixed several issues with <a href="classWt_1_1WLeafletMap.html">WLeafletMap</a> that were
<a href="https://redmine.emweb.be/boards/2/topics/16718" target="_blank">reported on the forum</a>.
</li>
<li>
<a href="classWt_1_1Chart_1_1WCartesianChart.html">WCartesianChart</a>: when there were so many bars on
a bar chart that the width of a bar became 0, placing tooltips would cause a crash. Wt will now skip
tooltip placement when bars get too narrow.
</li>
<li>
<a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a>: when
<a href="classWt_1_1WSuggestionPopup.html#a0395bd5080856eb95ccb50748f25d1c7"><tt>setDropDownIconUnfiltered(true)</tt></a>
was used, pressing the up/down arrows to move through the list would cause it to be filtered.
</li>
<li>
Reverted a previous change to <a href="classWt_1_1WModelIndex.html">WModelIndex</a>: since the comparison operator of model indexes uses the parent, we can't insert raw indexes into a <tt>std::set</tt>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7353" target="_blank">Issue #7353</a>: added mention in 3.5.0 release notes about
<a href="classWt_1_1WPdfImage.html">WPdfImage</a> pen width fix.
</li>
<li>
<a href="group__modelview.html#gaeb2f9c583490833afd55d65402b4fea9">registerType</a> now uses <tt>std::type_index</tt> instead of comparing <tt>type_info</tt> pointers.
</li>
<li>
Some widgets (like <a href="classWt_1_1WTreeView.html">WTreeView</a>) would not be properly sized when they were initially hidden.
</li>
<li>
Fixed a segfault in <a href="classWt_1_1WTableRow.html">WTableRow</a>, <a href="https://redmine.webtoolkit.eu/boards/2/topics/16732" target="_blank">reported on the forum</a>.
</li>