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glFinish is meant to ensure every aspect of the screen is fully-drawn before continuing. This causes issues with certain chipsets (Intel 4-8k) glFlush is more of a suggestion that CPU work is complete and the GPU should complete its work in a "timely" fashion. We add an additional glFinish call before getting a screenshot as this will copy the actual data from the card buffer. Fixes: lp:1775976 * https://bugs.launchpad.net/kicad/+bug/1775976