When plasma-desktop if started with no configuration, after moving applets added automatically (e.g. Folder View for ~/Desktop), they will 
jump back. This is bacause something triggers StartupCompletedConstraint more than once, which will cause multiple appletTransformedBy* 
connections, messing things up. Fix it by being more roust and ignore all but the first StartupCompletedConstraint.

svn path=/trunk/KDE/kdebase/workspace/; revision=1151078