[Wayland-bugs] [Bug 774475] New: wayland: gtk+ prevents using subsurfaces if the parent is not root

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774475

            Bug ID: 774475
           Summary: wayland: gtk+ prevents using subsurfaces if the parent
                    is not root
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: ofourdan at redhat.com
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

Description:

Under Wayland, a subsurface would have another surface as parent, but gdk would
not allow native windows if the parent is not the root window:

   https://git.gnome.org/browse/gtk+/tree/gdk/gdkwindow.c#n1218

As a result, the subsurface.c example in gtk+ is not actually using a Wayland
sursurface, because the parent is not the root window:

   https://git.gnome.org/browse/gtk+/tree/tests/subsurface.c?h=gtk-3-22#n49

Note, the test subsurface.c has been removed from master, but that's unrelated,
a program should be able to create a subsurface with a parent and not just the
root window.

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