Here https://docs.unity3d.com/ScriptReference/IMGUI.Controls.PrimitiveBoundsHandle.html it says that holding alt and dragging should grow box size in both directions. However, it doesn't work anymore.

To reproduce:

1. Open the project, attached by user
2. Select Box game object
3. Try alt + drag one of the sides of the box

Expected: Dragging one of the handles while holding alt should resize it in both directions
Actual: holding alt while dragging one of the handles doesn't do anything

Reproduced in 5.6.0f3, 2017.1.0b2
Did not reproduce in 5.6.0f1, 5.6.0f2
Regression introduced in 5.6.0f3