Code review comment for lp:~fschauk/stellarium/qopenglwidget

Looks like a thorough cleanout of old stuff, restructuring of the CMakefile for a faster build esp of the tests, and the removal of the deprecated QGLWidgets is a clear step forwards which should ensure longevity even beyond Qt5.7.
I have tested pinch/touch now on my netbook (40min compile...), works nicely on Win10!
I don't have any HiDPI hardware to test either, sorry.
I have tested a week ago on RaspberryPi. I compiles with the old classes from its old Qt5.3.2.
The performance loss on Windows is strange, maybe we should keep the old class on Windows for a while? On 2 PC-based Linux systems I saw consistently higher framerate.
I would like to hear about Mac compatibility, but from my side, I approve.