*+Description+*
When an overlay toolbar is moved, all the button tooltips in that toolbar reset and all shortcuts displayed in the tooltips disappear.

*+Initial setup+*
Create a graph and open it in the editor window

*+Reproduction steps+*
1. Hover over the 'toggle blackboard' button in the overlay toolbar. It should show something like "Blackboard (B)".
2. Move the toolbar to a different dock location
3. Hover over it again

This applies to the Graph Inspector and Minimap toggle buttons too.

Note: Shortcuts are _not_ shown on the general overlay toggle toolbar. They are shown on our own custom toolbars.

*+Expected behaviour+*
Expected: The tooltip shows the shortcut

*+Actual behavior+*
Actual: The tooltip just shows "Blackboard".