Fix UI thread main loop cancellation from another thread on macOS #12579
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What does the pull request do?
Ensure that the UI thread main loop is stopped.
What is the current behavior?
Cancelling the UI thread main loop from a different thread does not really stop the loop on macOS.
What is the updated/expected behavior with this PR?
Cancelling the UI thread main loop from a different thread stops the loop on macOS.
How was the solution implemented (if it's not obvious)?
When canceling the UI thread main loop from another thread on macOS,
dispatch_async()is used to post the work,[NSApp stop:nil], into the loop. However this will not stop the loop as it doesn't result in the posting of anNSEventobject (see https://developer.apple.com/documentation/appkit/nsapplication/1428473-stop for details). This PR posts the object to ensure the loop is stopped.This PR also fixes an issue that the
Runningflag is set too early.Checklist
Breaking changes
Obsoletions / Deprecations
Fixed issues