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compensate for DPR in canvas blur#18484
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* compensate for DPR in canvas blur
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When specifying blur on the 2D canvas the canvas applies it in bitmap pixels. However, because
bitmapSize / cssSize = devicePixelRatio(source), the blur ends up being inconsistent with the CSS blur applied to DOM elements.This change applies device-pixel ratio to the canvas blur so the two are consistent.
Fixes flutter/flutter#55933.
Requires flutter/goldens#97