Restore OpenGL classes disabled in Qt 6
QOpenGLWindow
has moved from Qt GUI to Qt OpenGL in Qt 6. Qtah does not yet support non-essential Qt modules (see issue #3), so this class has been temporarily disabled in the Qt 6 build. The helper class QtahOpenGLWindow
have also been disabled, as well as QOpenGLWidget
which has moved to the separate Qt OpenGL Widgets library.
Upstream docs: https://doc.qt.io/qt-6/qtopengl-module.html
(Spun off from #51.)