Add a dither parameter to dart:ui's Paint class

[jkurtw]

Gradients currently have a lot of color banding on all devices, and it looks very weird when using the pulse animation too. A solution is to make the gradients opaque, and to use dithered gradients with Skia. Dithered gradients aren't currently exposed, so adding a dither parameter to dart:ui's Paint class would be nice. We'd be able to manually draw our gradients with a CustomPainter.

b/143897620

[Hixie]

We should just make our gradients look good, I don't think we should add specific controls like this.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.