bug#55193: 29.0.50; Double-buffering on MS-Windows freezes cursor in minibuffer

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

> The new double-buffering feature on MS-Windows causes unpleasant side
> effect when the user types something into the minibuffer, then presses
> RET to submit and exit the minibuffer.  Without double-buffering, the
> cursor moves to the beginning of the minibuffer, thus providing visual
> feedback that whatever the user typed was submitted.  With
> double-buffering turned on, the cursor "freezes" in its last position,
> at the end of the minibuffer text, until the command finishes and
> redisplay does its job.  Which could be a tangible amount of time,
> during which Emacs looks "frozen".
>
> To reproduce:
>
>   emacs -Q
>   M-x blink-cursor-mode RET
>   C-x C-f src/xdisp.c RET
>
> Observe that the cursor is at the end of the file name until such time
> as xdisp.c is displayed, which could be a second or two in a
> non-optimized build of Emacs.
>
> Can this be avoided, please, i.e. can we update the display after the
> cursor is moved?

Thanks, should be fixed now.