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Simon Hull
af31e1464c
A document's first frame (opened, or its tab chosen) rendered on the UI thread: only a document with a frame already shown sent its frames to the worker. A heavy file froze the window until it was drawn, 8.7 s for the file of #4155 and 1.4 s for a 50,000-path SVG. The first frame now goes to the worker too, and the window shows the document's paper and artboards until it lands. The UI thread waits for it up to FIRST_FRAME_GRACE (16 ms) when it is queued (`Worker::wait`; `submit` says whether it queued), so a light document's art still shows in the same frame. The longest UI-thread stall opening those files is now 64 ms and 62 ms (M3 Pro, one run each). The web build, which has no worker, is unchanged.