Gijun Thank you for clarifying that; I understand now. Unfortunately, the current functionality does not support what you are trying to achieve, but the idea of snapping to other bones is interesting. I felt it was worth considering for future versions, so I created an issue here: EsotericSoftware/spine-editor950
As noted in the Workaround section of that issue, if you create bones so that the parent bone’s tip aligns with the child bone’s origin from the beginning, then even if you later need to adjust the parent bone’s length, you can move the child bone automatically while modifying the parent bone’s length, as described in my previous reply. For this reason, it is generally recommended to create bones with the parent bone’s tip aligned with the child bone’s origin in areas where you expect to use IK constraints later.
That said, I understand that there are situations where the parent bone’s tip and the child bone’s origin are initially separate and you may want to align them afterward. I hope we can improve this in future versions to make the workflow more efficient in such cases.
