Description Dejan Glozic 2004-03-26 16:37:59 EST

MultiPageSelectionProvider currently assumes that only nested editors can 
provide selections. This is unfortunate for FormEditor, where pages 
contributed as controls can also be selection source. 

The proposed fix is to check the active nested editor first. If the result is 
null, go to the multi-page editor site itself and see if it has a selection 
provider.

For example:

public ISelection getSelection() {
	IEditorPart activeEditor = multiPageEditor.getActiveEditor();
	if (activeEditor != null) {
		ISelectionProvider selectionProvider = activeEditor.getSite
().getSelectionProvider();
		if (selectionProvider != null)
			return selectionProvider.getSelection();
	}
	return null;
}

should be rewritten to be

public ISelection getSelection() {
	IEditorPart activeEditor = multiPageEditor.getActiveEditor();
	if (activeEditor != null) {
		ISelectionProvider selectionProvider = activeEditor.getSite
().getSelectionProvider();
		if (selectionProvider != null)
			return selectionProvider.getSelection();
	}
        else {
          ISelectionProvider selectionProvider = multiPageEditor.getSite
().getSelectionProvider();
                if (selectionProvider != null)
                        return selectionProvider.getSelection();
        }
	return null;
}

I didn't check other classes similar to this one, but in general, 
MultiPageEditorPart and its site should be given a try if active nested editor 
is not found.