Handles.SnapValue is not snapping properly with negative values.

Steps to reproduce:

1. Use the script given in attachment (SnapTestTool.cs)
2. Set a snapping increment value != 1 (0.25 for instance)
3. Enable increment snap, disable grid snap
4. Place an object at (0,0,0)
5. Activate the tool
6. Move the object using the handle

Actual results: The object is moved by 1 unit

Expected results: The object is moved from the incremental snap value

Reproducible with versions: 6000.6, 6000.5, 6000.4

Tested on (OS): Windows 11

Notes:

• Using : Handles.Slider(previousPos, Vector3.right); result in incorrect snapping
• Using Handles.SnapValue() API with negative values does not respect the documentation (value is snapped when it shouldn't)