cvt tool is split out of xorg-x11-server-Xorg in Fedora 41+, add
explicit dependency for it, as it's needed by qubes.SetMonitorLayout
service.

QubesOS/qubes-issues#9244

(cherry picked from commit f5ac7a8)

In case the service is stopped while Xorg is still starting up (and
gui-agent still waits for the Xorg connectin in mkghandles), gui-agent
would exit before killing Xorg and Xorg would try connecting back to the
gui-agent forever, delaying the shutdown.

Fix this by moving signal registration earlier, before Xorg startup.
Since ghandles_for_vchan_reinitialize is now set before its fully
initialized, initialize x_pid field explicitly and leave all the other
fields zeroed (instead of random stack rubble).

(cherry picked from commit 0806e2f)

Register proper signal handler for SIGCHLD, and collect the Xorg's
zombie in it.

This has two effects:
1. The main loop can explicitly exit on Xorg termination, not only via
   receiving EOF on the socket.
2. Due to not ignoring SIGCHLD anymore, accept() in mkghandles will also
   notice Xorg early exit and not wait indefinitely (it will fail with
   EINTR). For this case, improve error message.

There is still a small race on startup, if Xorg exits before reaching
accept() (or listen()) call. Handle this by checking just before
accept() call. It isn't perfect (there is still a few instructions
window where it wouldn't notice it in time), but it's good enough for
practical purposes.

QubesOS/qubes-issues#8060

(cherry picked from commit eaba72a)

Use X's logging function instead of plain perror, to ensure the message
is written in appropriate Xorg's log.

(cherry picked from commit 1d2026a)

If root session is started early and pipewire gets started as part of
it, it may connect to the audiovm earlier than the user's instance,
effectively stealing the connection. Upstream already has
ConditionUser=!root in relevant pulseaudio units, but not in pipewire
ones. Add similar condition to pipewire.service unit.

Fixes QubesOS/qubes-issues#9619

(cherry picked from commit 7be8161)

If Xorg is going to be terminated, do not try to connect to gui-agent
anymore. This avoids infinite loop when handling SIGTERM, and properly
shutdown instead.

(cherry picked from commit 0ad1350)

GTK 4.14.6+ (Fedora 41+) has moved 'GDK_DEBUG=foo-disable' to
'GDK_DISABLE=foo':

https://gitlab.gnome.org/GNOME/gtk/-/commit/cde094a0dfde3024fae18e0c0d36e7cf5f795dc6

New GTK versions print warnings for the old options:

    Unrecognized value "gl-disable". Try GDK_DEBUG=help
    Unrecognized value "vulkan-disable". Try GDK_DEBUG=help

(cherry picked from commit dcf6256)

Allow installing with newer pulseaudio in Arch. It uses a git snapshot,
but it was verified there is no API change.

Fixes QubesOS/qubes-issues#9660

(cherry picked from commit fa222f4)

The function takes an argument. Actual function used there was okay, but
the field in the structure used wrong type. And GCC 15 (rightfully)
started complaining.
Use CreateWindowProcPtr type to avoid similar issue in the future.

QubesOS/qubes-issues#9807

(cherry picked from commit a3f7636)

When formatted in double quotes, the @SOURCE_DIR@ may be problematic
with windows builder, as it will contain backslashes, and that will be
misinterpreted by the yaml parser. While the windows paths are not
relevant for those commands, .qubesbuilder file need to render correctly
in that case too.

(cherry picked from commit 5a50544)

(cherry picked from commit ca77a6e)

(cherry picked from commit 6898bf9)