This is useful when clients use subsurfaces independently of GDK.
For example if a client creates a subsurface that covers a GdkWindow
entirely. If this subsurface is opaque, Wayland compositors may not
emit callbacks for the surface of the GdkWindow any more.
Adding the covering subsurface via this new API ensures the
GdkWindow will continue to update in this case.
GdkAtom is a typedef to a pointer to an opaque structure. We need to
tell GTK-Doc how to override it, so that the documentation is accurate.
Fixes: #302
Fixes#1280, tray icons not drawing background. This is a magic pattern only
usable for gdk_window_set_background_pattern() that sets the underlying
X window's background to ParentRelative.
The internal known_globals hashtable is used to carry accounting for
interfaces that depend on others (as ordering is not guaranteed), extend
its usage so it also keeps track of unimplemented interfaces (here at
least).
The API call will then use this to allow querying the globals offered by
the compositor, it will be useful to determine whether we can use
text-input protocols or should fallback to other IMs.
This is an interface meant to be implemented by the "pad" devices.
This device-specific interface exposes the mapping of all pad features,
it allows retrieving:
- The number of buttons/rings/strips
- The number of groups
- The number of modes a group has
- Whether a given button/ring/strip belongs to a given group
https://bugzilla.gnome.org/show_bug.cgi?id=770026
