[Wayland-bugs] [Bug 772840] New: [Wayland] clutter stage subsurface needs clipping on Wayland

[clutter (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772840

            Bug ID: 772840
           Summary: [Wayland] clutter stage subsurface needs clipping on
                    Wayland
    Classification: Platform
           Product: clutter
           Version: git master
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: ClutterStage
          Assignee: clutter-maint at gnome.bugs
          Reporter: ofourdan at redhat.com
        QA Contact: clutter-maint at gnome.bugs
                CC: gnome at genodeftest.de, jadahl at gmail.com,
                    ofourdan at redhat.com, rob at robster.org.uk,
                    techet at gmail.com, wayland-bugs at lists.freedesktop.org
        Depends on: 771320
            Blocks: 757579
     GNOME version: 3.19/3.20

+++ This bug was initially created as a clone of Bug #771320 +++

The *positioning* of the GtkClutterEmbed widget and clutter stage should be
fixed with the patch from bug 771320 in gtk+, so now the widget moves along
with teh scroll window, but because it's using a subsurface on Wayland, it's
not clipped inside the scroll window/toplevel, so the widget will appear
floating around, sometimes outside of the toplevel window.

The goal of this bug is to implement clipping for the subsurface as used by
clutter under Wayland.

One posisbility is to use the viewporter extension, but it's not implemented in
mutter yet, so would be good to have a fallback solution as well, for when
viewporter is not supported.

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