Manipulating a custom handle slightly changes the transform.position of an object, even when the value is never touched by a script.

To reproduce:
1. Put the character in the scene
2. Expand his hierarchy
3. Select something deep in the hierarchy (e.g., LeftShoulder)
4. Add the NewBehaviourScript component
5. Enable the translation tool (either in the GUI or by pressing *W* keyboard shortcut)
6. Manipulate the custom handle (a white arrow at the origin)
7. Observe that LeftShoulder's position value on its transform component has slightly changed, and therefore become dirty (i.e. bold in Inspector)