QMessageBox was being used to test nested event loops. This has been
changed to use QEventLoop directly.
Also, there was an unnecessary use of QPushButton to trigger a test
case, which has been removed.
As a result, 3 test cases can be run on VXWORKS, and one more test case
on Windows that were previously skipped.
Change-Id: Ic65ed441cd37d242f89df3ef3b8638a1458d9cf3
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
2c4879a767