https://gist.github.com/p2or/30b8b30c89871b8ae5c97803107fd494
Material-UIList Demo for Blender 2.8+ (from...
Material-UIList Demo for Blender 2.8+ (from https://blender.stackexchange.com/questions/30444/create-an-interface-which-is-similar-to-the-material-list-box)...
materialdemoblender