This increases type safety, makes it more obvious that role_data
must represent the role object, and will allow for automatic
cleanup when the resource is destroyed.
This fixes a use-after-free in the Sway patch to filter the Xwayland
shell [1].
The server is destroyed first, then the shell. The Xwayland process
might still be using the shell while running.
When the shell is destroyed, libwayland will invoke the global
filter (to figure out whether to send a wl_registry.global_remove
to clients). Then Sway will compare the client with
wlr_xwayland_server.client. However, at that point, the server is
gone.
Reset the server to NULL so that Sway can check whether the server
is still running.
[1]: https://github.com/swaywm/sway/pull/7647
We'll soon introduce a unified wlr_surface map event. Up until now, compositors
have been using wlr_xwayland_surface's map event to setup various wlr_surface
related listeners (e.g. commit). This will no longer be possible when that
event is moved over to wlr_surface. Introduce new events where the compositor
can add/remove wlr_surface event listeners.
X11 clients expect a ConfigureNotify after a ConfigureRequest. If
the compositor/window manager chooses not to honor the request
(e.g. due to the window being maximized), XWayland will not send a
"real" ConfigureNotify event and the window manager is expected to
send a synthetic event instead. Otherwise, the X11 client is left
waiting and may not repaint its window properly.
For comparison, see Openbox's client_configure() or Weston's
weston_wm_window_send_configure_notify().
v2: Move logic to wlr_xwayland_surface_configure()
This is needed for compositors that want to reserve space for
XWayland panels. Such a feature can be useful in a "transitional"
setup, where only the X11 window manager and compositor is replaced
but other components of an X11 desktop environment are still used.
This change simply reads the X11 property; the compositor is free
to ignore it. Thus, compositors that don't want to support such a
"transitional" feature are not impacted.
v2: Update xwayland_surface_associate()
If a window is unmapped too quickly, we might receive UnmapNotify before
we get the corresponding wl_surface, which will later lead to
associating the same window twice. To fix this, move the NULL surface
check to xwayland_surface_dissociate(), which makes resetting the
unpaired link and the wl_surface object ID unconditional.
Fixes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3552
The dep allows us to check dep variables to discover supported
features. With the binary we assume none of the features are
supported. If a user forgets to install the pkg-config file (e.g.
because it's in a split package) we end up incorrectly disabling
all features. Instead let's error out.
Rename xwm_map_shell_surface() to xwayland_surface_associate().
This function doesn't actually "map" the surface in Wayland
parlance, the wl_surface may not have a buffer attached yet.
This can be used to know when wlr_xwayland_server decides to start
a new Xwayland process. At that point the wl_client has already
been created but the Xwayland process hasn't been started yet.
