fix: don't let pending shell operations block app exit on Windows - #52900
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shell.openExternal(), shell.openPath() and shell.showItemInFolder() run ShellExecuteEx()/SHOpenFolderAndSelectItems() on a COM STA thread-pool task with the default SKIP_ON_SHUTDOWN behaviour. A SKIP_ON_SHUTDOWN task that has already started blocks ThreadPoolInstance::Shutdown(), and ShellExecuteEx() can block inside the OS for as long as Windows is showing UI for the request - for example the "you'll need a new app to open this link" dialog for a URL scheme with no registered handler. The result is that app.quit() never completes (the process lingers after 'quit' has fired) until the user dismisses that system dialog. Post these tasks with CONTINUE_ON_SHUTDOWN instead, matching Chrome's platform_util::OpenItem, which uses that trait for the same reason. The tasks only touch their bound arguments and OS APIs, so letting shutdown proceed while one is still blocked in the shell is safe. Fixes #52141. No-Verification-Needed: Windows-only source not built on this host; verified via Windows CI experiment Co-authored-by: Sam Attard <sattard@anthropic.com>
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Backport of #52888
See that PR for details.
Notes: Fixed an issue on Windows where the app process could fail to exit after
app.quit()while ashell.openExternal()orshell.openPath()call was still waiting on a system "Open with" dialog.