Squish: Try to fix test for testing machines

Change-Id: I3213594c9ad7b947c5863d22f87e62adf418d983
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
Debugger: Fix visibility of Debugging Helper Dialog

Task-number: QTCREATORBUG-8440
Done-with: David Schulz

Change-Id: Iccd252cc743df37216884cbc0e5a51c96ac382b4
Reviewed-by: hjk <qthjk@ovi.com>
Squish: Fix WELP03

Change-Id: I811c394b95029addb84a727632cf2ab6901258a5
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
C++: fix invalid common prefix calculation.

This was the indirect cause for "random" freezes when using
code-completion. The direct cause was a while loop counting down to 0,
but starting with a negative value. Both are fixed now.

Task-number: QTCREATORBUG-8472
Task-number: QTCREATORBUG-8532
Change-Id: I782a46be3ac8282d7484d0bf0c6fd30be6b171c8
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
CMake: add out-of-source Qt Creator project files
GCC fix

Change-Id: I36509064f9d0d940dd232108a6aac2af595f4673