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".