Port from QGLWidget to QOpenGLWidget for hidpi support

Review Request #129672 - Created Dec. 18, 2016 and discarded

Information
David Weber
gwenview
350883, 368570
Reviewers
gwenview

https://doc.qt.io/qt-5/qopenglwidget.html says that QGLWidget is only a legacy module.

Used it a few times and the hidpi bug is fixed on my system

David Weber
Review request changed

Status: Discarded

Change Summary:

Found some strange problems with the toolbar....

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