**System Information**
Windows 8.1 pro 64bit, GT650M(2go)
**Blender Version**
Broken: 2.72 (95182d1)
Worked: na
**Short description of error**
This is a low priority problem but seems pretty easy to fix.
Dragging and dropping materials from one object to another does not update the 3D view when in rendered mode (cycles & internal).
**Exact steps for others to reproduce the error**
- Create two objects with 2 different materials and set the 3D view to rendered mode
- select object 1, go to materials tab, click and drag its material onto object 2
- 3D view is not updated in cycles or internal render mode