|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 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.