Re: emacs pgtk doesn't set WAYLAND-DISPLAY

[Po Lu <luangruo@yahoo.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Po Lu <luangruo@yahoo.com>
>> Cc: Julien Cubizolles <j.cubizolles@free.fr>,  emacs-devel@gnu.org
>> Date: Thu, 15 Feb 2024 16:11:05 +0800
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> >> From: Julien Cubizolles <j.cubizolles@free.fr>
>> >> Date: Thu, 08 Feb 2024 17:18:36 +0100
>> >> 
>> >> In Wayland, the following environment variables are set in a shell
>> >> 
>> >> WAYLAND_DISPLAY=wayland-0
>> >> DISPLAY=:0
>> >> 
>> >> In Emacs built with pgtk, only DISPLAY is set, with
>> >> DISPLAY=wayland-0.
>> >> 
>> >> I don't know if there is a good reason for that but it causes the
>> >> matplotlib python program to fail as it seems to expect a "valid" value
>> >> for DISPLAY or WAYLAND_DISPLAY to be set (see
>> >> https://github.com/matplotlib/matplotlib/issues/18377).
>> >> 
>> >> Maybe Emacs could just copy both the WAYLAND_DISPLAY and DISPLAY
>> >> environment variables instead of merging both ?
>> >
>> > Po Lu, any suggestions or comments?
>> 
>> I think this is was Emacs's treatment of WAYLAND_DISPLAY until we
>> received several bug reports that couldn't be resolved except by
>> refraining from changing that variable.
>
> Can you point to some of those bug reports?

bug#53969 comes to mind, though several more problems were reported, to
both this list and the bug tracker.