remember size, position and state of undocked tabs windows
Submitted by Jeff F.T.
Assigned to Jeff F.T.
When undocking parts of the ui, such as the media library, re-docking them will reset their position, width and height. Furthermore, closing pitivi will reset them to the "docked" state.
The reason I'm marking it as major is that without these things, being able to undock stuff from the GUI is useless.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=578672