What causes PopupMenu to close when you alt tab away from the app?

General JUCE discussion
1

What causes PopupMenu to close when you alt tab away from the app? I’m trying to make a component that replicates most of the behaviour of popup menus.

2

if you place a debug breakpoint in juce_PopupMenu.cpp on the MenuWindow::dismissMenu() function, you can get the stack trace. Something to do with a Timer in MouseState…

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Note: this is on a Mac with Command-tab…