a208d7c33e3902eeeae72e0e8789b7ddf346823f

When we update the main monitor, there is a rule that makes it so that popup windows use the same main monitor as their parent. In the commitf4d07caa38
the call that updates and fetches the main monitor of the toplevel accidentally changed to update from itself, causing a indefinite recursion eventually resulting in a crash. Closes: https://gitlab.gnome.org/GNOME/mutter/issues/279 (cherry picked from commite191c21e04
)
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