453378: IDesktop.dataChanged collect events 

Change-Id: I0d8682280c107ce8d86dcf171c86b4b29da67034
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=453378
Signed-off-by: Ralph Steiner <rst@bsiag.com>
Reviewed-on: https://git.eclipse.org/r/37628
Reviewed-by: Judith Gull <jgu@bsiag.com>
Tested-by: Hudson CI