This opens a new frame for buffer *Completions*. At least in Windows, the
new frame is selected. The frame focus for typing key sequences thus
switches to the *Completions* frame, but the minibuffer of the original
frame is still waiting for input. So, you cannot continue to type, to
disambiguate the command you want.
You would have to move the mouse to the other frame, I guess.
Is that what you're complaining about, or is it some other behavior?
Is it a Windows-only behavior?
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