Support drag 'n drop to move items inside layout containers
Similar to #60 (closed), but for the content or preview view. If you add something like a GtkBox
or a GtkGrid
, you get a couple of placeholders to place items in. If you then place an item in two of those, it would be handy to be able to use drag 'n drop to move them to one of the other placeholders to be able to reorder them.