protected boolean isAddToPopup(DockingAction action) {
		return true;
	}
A method that subclasses can override to decide if the given action should appear in the 
popup menu.  Most subclasses will not need to override this method.  An example for 
overriding this method is one of the subclasses that have their own version of one of the 
built-in actions, such as Expand All.  Some clients have a custom expand action.  In that 
case, the client wants their action in the menu and not the built-in version.

@param action the action 
@return true to have the action appear in the popup; the default is true
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/GTree.java