Thanks, BTW this commit crashe QET on old distribs perhaps they don't support C++ 11, like Debian Stable aka Jessie (verified), and surely also Ubuntu 14.04 aka trusty!
I need to try QMAKE_CXXFLAGS += -std=c++1y for Jessie....
https://wiki.debian.org/GCC5
But, if it can resolve stranges bugs we have, that a good think, otherwise we wait users tests before add other codes, in order to facilitate revert if is need !