The fix for the display "hiccups" in OpenGLContext turns out not to be a fix at all... it just pushed the timing off in that particular case so that it didn't happen. Other tests are now showing the effect (the display displays the new frame for an instant and then redisplays the original for one frame out of two).
Honestly, I'm a bit fed up with it for this evening, so I think I'll do something less annoying until bedtime.
Most annoying part is that it's such a trivial problem. Likely changed a call somewhere so that it's not properly telling the context to redisplay, or moved a call to swap buffers, or... something stupid.
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