Imprecise Rotation Values produced in the Details Panel when using the Rotation Widget in the Viewport

Starting with an asset (static mesh for instance) with a precise rotation value (such as a whole number) in the details panel will result in a imprecise, slightly fractional off value when rotated using the transform widget.

In other words, if you start at a rotation value of "0" and rotate the object "90 degrees" the resulting value in the details panel will be fractional: 89.99985

This is worse with grouped objects (-89.999962, for instance)

1. Open any project in UE4.9, UE4.10 or UE4.11
2. Drag a static mesh box into the viewport
3. Select top view in the viewport
4. In the details panel, enter whole number values for the transform and rotation values of the static mesh
5. select the static mesh and rotate the mesh using the transform/rotation widget 90 degrees
   RESULT: The rotation value in the details panel will be fractionally off (-89.999985 for example) *See attached image
   EXPECTED: The value in the details panel to be the exact numeric value rotated by the transform widget (90, 45, 20.5, 180 etc)

Fix UE-51650

[UE-23848] Bug Status

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