[Feature]: Notify JS layer when restarting webview due to crash

[sandstrom]

Description

It would be great if the JS-layer (Capacitor app) could know that the underlying web view crashed and subsequently restarted. Right now there is nothing to discern these from a regular app startup and users won't be aware that data was lost.

Platforms

• iOS
• Android
• Web

Request or proposed solution

More concretely, an issue that occur frequently is that we take a photograph via an <input capture> element and do on-the-fly resize using JS and canvas, and the web view crashes, causing the page to reload. But for the user this isn't obvious, it's just a short flash when the web view reloads, and they don't know that the photograph failed and they've just lost data.

If we could listen to these events we could show a warning to the user.

This is the code on iOS today:

capacitor/ios/Capacitor/Capacitor/WebViewDelegationHandler.swift

Lines 158 to 162 in e8507cf

	open func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
	CAPLog.print("⚡️ WebView process terminated")
	bridge?.reset()
	webView.reload()
	}

Platform Support Requested

• Android
• iOS

Describe Preferred Solution

There are multiple solutions, but one could be a listener similar to appRestoredResult , that would let us know that the app restored after a crash.

We'd then have the ability to show a warning to the user.

Additional Context

This related issue about the web view crashing when taking photos: #2265

Additional Information

This is an old issue that was closed, with a request to reopen if it's still valid.

#2379