Po Lu <luangruo@yahoo.com> writes:

> Davide Masserut <dm@mssdvd.com> writes:
>
>> Correct.  However, that TTY is occupied by the X window manager,
>> which hides the Emacs interface.
>>
>> When the argument of --display doesn't exits or is empty, should we
>> check if $DISPLAY is present in the environment and use its value?
>>
>> When PGTK is enabled, we could check $WAYLAND_DISPLAY and then
>> $DISPLAY before resorting to displaying the frame in a terminal or in
>> a TTY.
>>
>> I tested this with Gnome and i3, both started from a TTY using
>> startx. I'm not sure how this behaves when using a display manager.
>
> Display selection is GTK's territory, and we basically give it carte
> blanche to judge which displays are suitable, since we can't account
> for every present and future GDK backend.
>
> Only subsequent to the establishment of the display connection are we
> capable of taking display-specific action, such as displaying a
> warning message.

It turns out that Emacs 29 has new CLI option that solves exactly these problems.

The attached patch replaces the usage of --display=$DISPLAY with --reuse-frame.