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Changes are based on cmaughan's fixes from ocornut#3757 (comment) but messed with a bit to work on Xemu's ImGUI fork. The result is that ImGUI won't render at a low-DPI resolution anymore and now should provide crisp UI on Retina Macs (although the in-built UI scaling option in Xemu will need to be set to 2x to ensure the UI isn't tiny).