webview: sometimes focus is not passed to editor when clicked into

[bpasero]

Extracted from #56988 (comment)

Steps to Reproduce:

1. install negokaz.live-server-preview
2. have below HTML file
3. "Show Live Server Preview"
4. click into the preview on the right and left a couple of times

=> 🐛 at some point the editor focus is not detected, even though we clicked into the webview

[bpasero]

Maybe related: electron/electron#13697

Also: https://github.com/wireapp/wire-desktop/pull/1915/files#diff-230d8ff5ba91cf235b1f137942860593R23

[mjbvz]

I could not get focus-change to work reliably.

The issue here seems to be that this extension is using an iframe inside of the webview.However they are also using the old vscode.previewHtml command instead the new webview API: negokaz/vscode-live-server-preview#14

Not sure if using previewHtml makes any difference but I'll test an iframe using the webview api

[mjbvz]

The only way I could find to reliably track focus for webview contents that include iframes is polling. If you have any other ideas here, please let me know as I'm not a fan of this solution

[bpasero]

@mjbvz maybe leave in a todo for you to check back on that workaround, it is possible that the webview might get fixes in the future. At least we should check when we update to Electron 4.

I also could not find any good solution and it seems others are having issues too.