f78cfc0c80
When using CLUTTER_DEBUG_PAINT_DAMAGE_REGION, the blue swap region is always a superset of the red redraw region. So painting both in full (since the previous commit) just meant the red region was overdrawn and came out purple. That doesn't provide enough visual contrast, changes the user experience unexpectedly and reduces performance. So just subtract the redraw region from the swap region. This way the red redraw region is always red, not purple. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1571> |
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