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

[gtk+ (GNOME Bugzilla)]

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

--- Comment #11 from Olivier Fourdan <ofourdan at redhat.com> ---
I reckon you need to set the transient_for first to walk up the tree and detect
all possibilities.

Consider this case, two valid and distinct transient trees (where "->" means
"is transient for"):

[ A ] -> [ B ] -> [ C ]

And 

[ D ] -> [ E ] -> [ A ]

Now the program tries to set [ C ] -> [ D ] (ie C becomes transient for D)

If you start walking up the tree starting from C, you won't hit D in the first
tree, neither you will hit C walking up the second tree starting from D, and
yet, if  C becomes transient for D, you'll have a loop:

[ A ] -> [ B ] -> [ C ] -> [ D ] -> [ E ] -> [ A ]

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