Pierre de La Morinerie c4dbdeba0a Fix QGLWidget viewport resize on macOS
This fixes #2092, a long-standing bug where on macOS resizing the window
results in a garbled display.

It seems the seemingly optional child()->makeCurrent call is actually
required on macOS. Enabling it in all cases fixes the resize issue.
2018-03-11 19:22:30 +05:30
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