[Development] QGLWidget drawing origin inconsistent in 5.0

[Chris Meyer]

After doing further testing with my application under Qt 5.0, I've
narrowed down one of the OpenGL issues I'm seeing.

It looks like if QGLWidget is added to a view hierarchy that hasn't
been inserted into a window yet, the QGLWidget uses the wrong origin,
even after it is later added to a window.

I've filed a bug and built a short test program to demonstrate the issue.

https://bugreports.qt-project.org/browse/QTBUG-27214