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WGL: Avoid using swap exchange on NVidia drivers

Luca Bacci requested to merge wgl-updates into main

It seems that NVidia sets PFD_SWAP_EXCHANGE / WGL_SWAP_EXCHANGE_ARB on pixel formats but doesn't guarantee that the backbuffer age is constantly 2. My guess is that they use swap exchange only to advertise a flip present method.

This basically forces swap copy with NVidia drivers

Fixes #7019

Edited by Luca Bacci

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