Fix double click on removed lines in unifieddiffeditor

Task-number: QTCREATORBUG-12493
Change-Id: I31c63cfb5f05e73595fc42eef258998e2783697a
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
QmlDesigner: Tweak item library

Change-Id: Ia9f689c33e9590815cbd00bdf13d0d05466d37d0
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>