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In my scenario, nobody stole the focus. That's not the problem.
A popup menu legitimately had the focus, which includes a mouse grab so that clicking outside the menu causes the menu to go away.
But then, before the menu actually goes away, the debugger suspends the app. The app never gets a chance to dismiss the menu, and I can't interact with the debugger to resume or terminate the app. *That* is what soft-locked my desktop.