2b2a8b4747
In a normal user session you can't have more than one popup, because the popup is modal and we don't allow the popup to show up when there are other modals. In a GDM session, however, the login dialog is modal, and we want a popup, so we don't have that same check. This commit changes the ctrlAltTab manager code to not allow multiple popups. https://bugzilla.gnome.org/show_bug.cgi?id=659177