As discussed on the development mailing list, the window list returned
by QGuiApplication::topLevellWindows() included all QWindows, even the
non top-level ones.
This commit introduces the new method allWindows(), which returns the list
of all QWindows, fixes the list returned by topLevelWindows() and also
introduces tests for both methods.
Change-Id: I761f0fcdec79f83949012c628655ed12cd18572c
Reviewed-by: Jonas Gastal <jgastal@profusion.mobi>
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>