More UI lists into Treeview (or add Move up/down)

Since the Shape Keys UI was upgraded to a Treeview in Blender 5, I feel other parts of the interface could benefit from a similar update. As a fallback, simple “move up/down” controls could be added to some of the UIlists.

Example: I frequently compare renders using render slots to fine-tune settings for long animations. Switching between them depends heavily on their slot order, so being able to rearrange them would be a real improvement. The gif is not really self explanatory but you get the idea, imagine dealing with 10 slots and wanting to compare slot 2 and 8.

Areas that I think could use this improvement.

• Materials
• Vertex groups
• Attributes*
• Render slots*
• Particles*
• UVMaps*

*: fallback: adding arrows to UI lists

UIList + arrows

Treeview