It would be nice to have a minimize-icon next to the menu of the Leaf.
Clicking on the minimize icon would:
- hide the leaf and all its dockables completely
- add an icon to a side-bar, representing the leaf
The side-bar would only be visible when 1 or more Leafs are minimized.
Clicking on the leaf-icon on the side-bar would restore the Leaf to its former state.