XtextRenameResourceParticipant is unnecessarily loaded for rename actions

[MWI-msg]

XtextRenameResourceParticipant.initialize(..) returns true by default, without checking if the renamed element is relevant for this participant. That causes unnecessary appearances of a refactoring dialog within our Eclipse-based application.

The participant should at least consider the if checks from the addElement(..) method for its return value.
So instead of:

@Override
	protected boolean initialize(Object element) {
		addElement(element, getArguments());
		return true;
	}

It should be something like:

@Override
  	protected boolean initialize(Object element) {
          if (arguments instanceof RenameArguments && element instanceof IResource) {
              addElement(element, getArguments());
              return true;
          }
          return false; 
       }