Re: Change to `use-dialog-box-p'

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Date: Sat, 20 May 2023 10:45:21 +0800
> 
> After:
> 
> 2023-04-02  Eli Zaretskii  <eliz@gnu.org>
> 
>       * lisp/subr.el (use-dialog-box-p): Fix conditions for GUI dialogs.
> 
> dialog boxes will no longer be used when there is no last input event at
> all, i.e. when `last-nonmenu-event' is nil.
> 
> Previously, `use-dialog-box-p' would only return nil if
> `last-nonmenu-event' was a key event, which is the correct behavior;
> `Fyes_or_no_p' still uses the correct test.
> 
> Why was that change made?

Because last-nonmenu-event being nil happens in too many cases where
showing the GUI dialog is not TRT.  Immediately after startup, for
example.

What is the situation where you need to show a GUI dialog even though
last-nonmenu-event is nil?