Scaling snap for selected object are reset to the origin of the scale pivot location

When scaling multiple selected actors in the scene with snap enabled the actors will reposition to the pivot origin of the last selected actor in the group when going down to a value of 0 or a negative value. Going back to a positive value will keep the actors at this location. If Snap is disabled the actors will not be affected in this manner.

This is a regression of behavior in 4.10.4 where it did not occur, but it currently appears to do this in 4.11, 4.12, and Main.

Notes: Looks like there was a change in how selected groups are scaled from 4.10.4 where they would scale, but not use snap even it was enabled. With 4.11.0 it appears that the selected actors now recognize and use the snap functionality for scaling.

1. Open UE4
2. Place at least two static meshes.
3. Select both static meshes and scale to 0 or a negative value
4. Now re-scale the selected objects back to a positive value

Regression: Yes

Results: When scaling selected objects with snap enabled if the objects are scaled to 0 or a negative value they will be grouped up at the pivot location of the last selected mesh in the group.

Expected: Scaling the selected objects should not move them to the origin of the last selected object.