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"Only Insert Needed" doesn't work when using Trackball rotation
Closed, ResolvedPublic

Description

System Information
Windows 10 Home, 64-bit
GTX 780

Blender Version
Broken: 2.78a

Short description of error
Rotating an object or bone in Trackball mode doesn't add rotation keyframes when Only Insert Needed is enabled.

Exact steps for others to reproduce the error
Enable Only Insert Needed in the Preferences and Automatic Keyframe Insertion on the Timeline.
Tap R once to rotate the default cube on a single axis, and all rotation keyframes will be inserted. Jump a few frames ahead, double-tap R to rotate it with Trackball rotation, and no rotation keyframes will be inserted.