An AppKit local event monitor (apps/vectorcraft/src/mac_tablet.rs) reads each mouse and tablet event's pressure and the pen's end before winit's view handles it and writes them into the canvas's StylusFeed. The feed keeps the pressure of each pointer move, and the canvas pairs them with the frame's moves, so a fast stroke keeps its curve and each point its own pressure; mouse event coalescing is off. The eraser end selects the Eraser tool, as on Linux. Ported from PhotoCraft's crates/tablet (pressure and eraser end only).
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