xdg-desktop-portal 1.17.x introduces a new way to select which portals will
be used for which desktop environments, modelled on mimeapps.list:
- each desktop environment should provide a file like
/usr/share/xdg-desktop-portal/windowmaker-portals.conf
- the filename is ${DESKTOP}-portals.conf where ${DESKTOP} is the desktop
environment's entry in $XDG_CURRENT_DESKTOP (the same as the DesktopNames
from /usr/share/{x,wayland-}sessions/*.desktop), folded to lower case
- sysadmins and users can override this via files named portals.conf or
${DESKTOP}-portals.conf in various locations like /etc/xdg-desktop-portal
and ~/.config/xdg-desktop-portal
Please see portals.conf(5) or its source code
https://github.com/flatpak/xdg-desktop-portal/blob/main/doc/portals-conf.rst
for full details.
If I'm reading its code correctly, I think wmaker asks the display manager
to set XDG_CURRENT_DESKTOP to "WindowMaker"? (But if I'm wrong, please
adjust my suggestions accordingly.)
As a backwards-compatibility mechanism, x-d-p will fall back to trying to
guess the most appropriate portals from the portals' deprecated UseIn=
fields, but it will log warnings when it does that, and anyway Debian
doesn't currently ship any portal backends that are flagged as suitable
for WindowMaker. Please add a windowmaker-portals.conf to tell x-d-p
more explicitly what backends wmaker is meant to be using by default.
For example, if the intention is to use the x-d-p-gtk backend,
the way to write that would be:
[preferred]
default=gtk;
The desktop environment (either wmaker-common or some larger metapackage)
should probably also have a Recommends, or at least a Suggests, on
whatever portals would be most appropriate for it.
Thanks,
smcv