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a5493a1cd0
A subpath's anchors are now an `Anchors` list held in chunks of up to 256 anchors behind `Arc`s. Copying a path copies the chunk table and shares the chunks, and editing one anchor copies only the chunk that holds it, so the undo step of a one-anchor edit no longer keeps a copy of every anchor of the path. Inserting or removing an anchor copies the chunk it is in and rebuilds the table. Reads and edits follow the Vec and slice methods the code used; files write and read each subpath's anchors as one list, as before, within the same anchor read budget. The undo memory estimate counts only the chunks the other version of the path does not hold, and the renderer's kept paths compare only the chunks an edit copied when they look for moved anchors. Moving one anchor of an open path of 10,000 or 200,000 anchors (path.moveAnchor, path.setHandle, path.moveAnchors, a nudge) keeps at most 48 KiB in its undo and redo steps, where it kept 56 bytes per anchor.