The issue was that a ':' at the beginning denotes a Qt Resource and in that case QDir::isAbsolutePath() would return true. The bug is fixed by guarding against that condition in slotOk().
Also guard other QDir::isAbsolutePath() usage the same way.
Since this logic will be used in various places use a helper function, isAbsoluteLocalPath() (thanks to dfaure for coming up with that name), in pathhelpers_p.h.
Extend the unit tests.
BUG: 322837 FIXED-IN: 5.78