xwayland display variable

[Simon McVittie]

On Wed, 01 May 2019 at 14:30:52 +0300, Damian Ivanov wrote:
> export WAYLAND_DISPLAY=wayland-1
> GDK_BACKEND=x11 gedit //starts on wayland-0

If you are using GDK_BACKEND=x11, then gedit is not acting as a native
Wayland app, so it will not look at WAYLAND_DISPLAY. Instead, it will be
acting as an X11 app, which obeys the traditional X11 DISPLAY environment
variable (and in your case it happens to connect to an Xwayland instance
that is already associated with one of the Wayland displays, but the X11
backend in GTK has no knowledge of Wayland, so it can't know that).

If you want an application to appear on one of your Wayland displays,
irrespective of whether that application is using native Wayland or
X11 via Xwayland, then you need to put a matching pair of WAYLAND_DISPLAY
and DISPLAY in its environment.

Alternatively, if you let gedit use native Wayland (stop using
GDK_BACKEND=x11) it will respect WAYLAND_DISPLAY.

    smcv