xsvm 6d21a69968 Brush: symmetric live strokes update only what changed (#3593) (#3605) ...

With painting symmetry on, every pointer event cloned and finished the stroke and each mirrored
pass, merged them again, composited the whole stroke and restored each pass's full bounds, so an
event cost grew with the area painted so far. StrokeRenderer::composite_union_live merges and
composites only the coverage tiles that changed (new dabs, the smoothing tails now and before),
leaving exactly the pixels the full merge gave; a mirror joining redraws every tile once.

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..

examples

Format: adopt the craft-family rustfmt.toml and format the workspace

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src

Brush: symmetric live strokes update only what changed (#3593) (#3605)

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Cargo.toml

more algorithms, progress

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