[Interest] QSurfaceFormat and swapInterval

[Peter Koek]

QGLFormat exposes a swapInterval property which can be used to enable vertical synchronization (v-sync) to avoid screen tearing.Why does QSurfaceFormat not expose this property? Currently, there is no direct way to enable v-sync with QWindow, while QGLWidget did not have this problem.What is the rationale for leaving this out? 		 	   		  
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