a330c4ff97
Update: Blocked on https://github.com/flutter/engine/pull/44912 landing, and merging into google3. --- Partial work towards https://github.com/flutter/flutter/issues/112498. _**tl;dr**: In Impeller's backend we intend to _always_ dither gradients, and never allow any changes long-term (i.e., write your own shader if you want different behavior) with the assumption that dithered gradients look better most of the time, and don't typically hurt elsewhere._ Note that, at the time of this writing, I couldn't find a single case of this being set explicitly to `true` inside Google, and there are between [100 and 200 publicly accessible on GitHub](https://github.com/search?q=%22Paint.enableDithering%22+language%3ADart&type=code&l=Dart), of which virtually all are setting it explicitly to `true`. There are some (valid) concerns this would cause a lot of golden-file image diffs, so I'm going to seek explicit approval from the Google testing team as well as someone from the framework team before landing this commit.
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