Mario Zechner 29e2eac56e [cpp] Port additive timeline and color flicker fixes from spine-libgdx
- Revised which timelines support additive blending: IK and path
  constraint mix timelines no longer support add blend (treat as
  replace). Physics constraint timelines only support add for wind
  and gravity. Ports spine-libgdx commit b92058975.

- Fixed alpha and RGB timeline flicker when blend is setup and alpha
  is not 1: interpolate from setup value instead of set-then-add.
  Clamp color output to 0-1. Ports spine-libgdx commit 8943c84d8.
2026-03-14 15:10:57 +01:00
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