Glitches/spillover of a colored region when a very large circle is bounding it

[pier-bezuhoff]

Example: correct vs spillover

Description

When at least one of the circles/lines bounding a colored region is a circle of very big radius (the threshold varies per platform), the region is constructed & displayed incorrectly (exact visual bugs vary, often it's exterior<->interior)

Reason

Path for colored regions is constructed using compose's Path.op(..., PathOperation.x) (source),
which poorly deals with giant circles (especially on Android, but it's still quite noticeable on other platforms that use Skia afaik)

Potential solutions

• Re-implement path construction, focusing on proper handling of arbitrarily large circles and lines (wrote some WIP algorithms)
• Aggressively approximate big circles with lines (already doing this for solo-circle display on Android)

[pier-bezuhoff]

Merged glitch fixes into master, most of them are gone with rare exceptions, seemingly unrelated to large radii. Example attached (tangential touch issue).

broken-cube-2.yml.txt