| index | The index of the key to move. |
| key | The key (with its new time) to insert. |
int The index of the keyframe after moving it.
Removes the keyframe at index and inserts key.
If a keyframe already exists at key.time, then the time of the old keyframe's position key[index].time will be used instead. This is the desired behaviour for dragging keyframes in a curve editor. Returns the index of the keyframe after moving it.
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