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e73f51debc
The Layers panel chose between the UI thread and the thumbnail thread for a row's first thumbnail by counting objects only, so one path of 200,000 anchors was rendered on the UI thread. A row whose paths hold more than 2,000 anchors in all now goes to the thumbnail thread, as a row of more than 200 objects already did. While such a row waits, the painted fallback thumbnail draws nothing for it instead of measuring the path's bounds on every frame. Opening the panel on one path of 200,000 anchors: the first frame takes 2.4 ms instead of 393 ms (release build, median of three runs).