Windows 7 Professional 64-bit SP1
Nvidia GeForce GTX 760
Broken: Blender 2.75a ...up to and including current version... 2.77 rc2
Description: When moving a keyframe from within the dope sheet editor the movement of the keyframe within the graph editor does not reflect the true condition of the new curve until the action is finished.
This is a small visualization bug.
It will be seen that when a keyframe is moved in time (along the X axis) from within the graph editor the keyframe handles as well as the associated curve will change as required during the move to constantly reflect changes related to the new position of the keyframe.
When the keyframe is moved from within the dope sheet editor the keyframe will also move within the grpah editor, but the simultaneous updating of handle length and correct curve shape will not be shown. However, when the action is completed, the curve and handles in the graph editor will update to reflect the new, correct position.