When setting Right/Left tangents of a key, the tangent on the inverse side is affected instead of the intended tangent.

repro:
Create a key and set the Right tangent to something else (ex: Linear or Constant). Notice how the Left tangent got modified instead of the Right tangent. The inverse is also true (Left affect Right).

workaround: set both tangents.

this is a regression...
Works as expected in...
Version 5.4.0b22 (518a15457bf6)
Fri, 10 Jun 2016 20:29:39 GMT
Branch: 5.4/staging

broken in...
Version 5.5.0a1 (eaa4de384f97)
Wed, 08 Jun 2016 19:59:23 GMT
Branch: 5.5/animation/dev