a2dcf44c60
The existing semantics of the tile_mode property are terribly confusing, as it depends on some other property whether it represents the requested or current mode. Clear this up by just using separate variables for the two. As it is unlikely that we will ever support more than one tile preview, we can track the requested mode globally instead of adding another per-window variable. https://bugzilla.gnome.org/show_bug.cgi?id=645153