[Wayland-bugs] [Bug 759299] wayland: possible infinite loop in gdkwindow-wayland

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759299

--- Comment #3 from Olivier Fourdan <ofourdan at redhat.com> ---
Created attachment 317380
  --> https://bugzilla.gnome.org/attachment.cgi?id=317380&action=edit
wayland: Check transient depth

Gdk Wayland backend traverses up the window tree looking for transiency
parents, but does not check for cycles when doing so.

As a result, if two or more windows are transient to each other, the Wayland
gdk backend will enter an infinite loop.

While this is clearly a bug in the application, gtk+/gdk should be more robust
and handle such errors more gracefully.

To avoid looping infinitely, add a transient depth and check that the parent
window in on a lower transient depth and exit the loop otherwise.

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