test_theme: add tooltip to color mode combo box

Author: PierreRaybaut

guidata/qthelpers.py

@@ -225,7 +225,9 @@ def set_color_mode(mode: Literal["light", "dark", "auto"] | None = None):
         dpsc(QG.QPalette.Disabled, QG.QPalette.HighlightedText, disabled_color)
         app.setPalette(dark_palette)
         app.setStyleSheet(
-            "QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }"
+            "QToolTip { "
+            "color: white; background-color: #2a82da; border: 1px solid white;"
+            " }"
         )
     elif DEFAULT_STYLES is not None:
         style, palette, stylesheet = DEFAULT_STYLES

guidata/tests/widgets/test_theme.py

@@ -47,6 +47,12 @@ def setup_widgets(self):
         self.combo.setCurrentText(self.default_theme)
         self.combo.currentTextChanged.connect(self.change_color_mode)
         self.combo.setSizePolicy(QW.QSizePolicy.Expanding, QW.QSizePolicy.Minimum)
+        self.combo.setToolTip(
+            "Select color mode:"
+            "<ul><li><b>auto</b>: follow system settings</li>"
+            "<li><b>light</b>: use light theme</li>"
+            "<li><b>dark</b>: use dark theme</li></ul>"
+        )
         hlayout = QW.QHBoxLayout()
         hlayout.addWidget(label)
         hlayout.addWidget(self.combo)