Squish: Stabilize invoking tab item widgets on Mac

Change-Id: I16a61c1215d64243238a4cfbee007a78c282eb4c
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
Fix wrong diff output with span lines

Task-number: QTCREATORBUG-9494

Change-Id: Ica26e1448b1997e102648be58128f1be00c4905e
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Christian Stenger <christian.stenger@digia.com>