public Action getAction(KeyStroke ks) {
		return keyBindingsManager.getDockingAction(ks);
	}
Checks whether the given key stroke can be used for the given action for restrictions such as
those for System level actions.
@param action the action; may be null
@param ks the key stroke
@return A null value if valid; a non-null error message if invalid
Ghidra/Framework/Docking/src/main/java/docking/actions/ToolActions.java