bug#26513: 25.2; pop-up-frames and *Completions* buffer

[martin rudalics]

>> >From emacs -Q:
>>
>> M-x set-variable RET pop-up-frames RET t RET
>> M-x global- TAB
>>
>> The *Completions* buffer is opened in a new frame, but the cursor is in
>> the frame too, so the user has to switch back to the minibuffer to
>> continue typing.
>
> This problem is still present in Emacs 29.  I guess the general solution
> here would be for completion to ensure that it's gotten focus back again
> after displaying the *Completions* buffer?

Maybe Stefan Monnier can tell us what he does in such case.

I can offer the attached, largely untested patch.  A possible
customization would then be

(customize-set-variable
 'display-buffer-alist
 '(("*Completions*"
    (display-buffer-reuse-window
     display-buffer-pop-up-frame)
    (reusable-frames . t)
    (redirect-frame-focus . t))))

martin

redirect-frame-focus.diff
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