public void ownerRemoved(String owner) {
		placeholderManager.removeAll(owner);
		scheduleUpdate();
	}
Returns any action that is bound to the given mouse binding for the tool associated with this
DockingWindowManager instance.

@param mouseBinding The mouse binding to check for a bound action.
@return The action associated with the mouse binding , or null of there is no binding for the
        given keystroke.
Ghidra/Framework/Docking/src/main/java/docking/DockingWindowManager.java