Implement "secondary window" support for Electron #12481
Merged
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What it does
Fixes #11642
The main change is to prevent the secondary window from closing until the extracted widget is removed from the window. This includes waiting until any close handling (including dialogs) are finished.
To enable this properly, dialog support has been extended to work with secondary windows, including support for the StylingService in secondary windows.
Contributed on behalf of STMicroelectronics
How to test
The test scenarios from #11048 apply, but run them in electron
Review checklist
Reminder for reviewers