[Wayland-bugs] [Bug 789127] New: wl_subsurface_set_position () called with wrong initial value

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789127

            Bug ID: 789127
           Summary: wl_subsurface_set_position () called with wrong
                    initial value
    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: william at attente.ca
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

https://git.gnome.org/browse/gtk+/commit/?h=gtk-3-22&id=8aa6d59b7a214ba03a83bcae8c43712f8e402927

This commit to gtk-3-22 seems to expose a bug where Totem in maximized mode
causes the video to be offset from the origin (see attached screenshot, the
problem is worse in full-screen).

It seems as if the initial call to wl_subsurface_set_position () is done with
an incorrect initial position that would have been corrected at a later call,
but since the idempotency check was added, this is no longer the case and the
subsurface is left at the incorrect initial position.

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