- We should only call workspaceRemoved() for workspaces that are
are actually being removed.
- When we have multiple monitors, a window on a secondary monitor is
on all workspaces, so it ends up in all workspaces _allWindows
lists, so we can't use previous presence in that list to determine
whether we need to go ahead and add the actor; allWindows is simply
the list of windows where we are listening to notify::minimized.
https://bugzilla.gnome.org/show_bug.cgi?id=667652
0080440118