I wouldn't call it a bug. That solution seems good to me.
Question about Auto IK UI (should bones -- which ones?) show their IK settings if Auto IK is enabled? All of them since you can…
It probably shortens as a normal expected solution by the IK Solver so I doubt it's a bug. The IK Solver implements stretch by translating a bone's tip along their local Y-axis. After the solver…
At a glance, it looks like a missed copy/paste:
in 9da88301efea47d184f347f2b2e54742351361d7 : (anim_sys.cc, L3238) should be `r_action_strip->flag
It's not necessary. I think I just accidentally mixed a bit of cleanup with the fix: There's no need for the NOTHING
check anymore. Should I remove it or separate the cleanup into its own…
when visually keying frame 30 from IK, then turning off the IK should result in the bones remaining precisely where they are
This is what's happening. That's why I added a reference circle…
Here's a video explanation based on your video showing that things work properly. Let me know if I misunderstood anything.