260c082c4e
We currently call the session updated handler as soon as the session modes are read. This handler sets up keybindings for leaving the overview (if a user session) and shows the login dialog (if a gdm session). We can't do the latter until the stage is mapped because it takes a grab, and we don't need to do the former until the user goes into the overview. This commit defers processing session updates until the the layout manager says start up is prepared. It fixes a race condition at login screen startup now that we don't show the stage right away. https://bugzilla.gnome.org/show_bug.cgi?id=694321
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