fix: Fix small bug from - B 4.2 texture transform bind preview

[tdw46]

No description provided.

[tdw46]

I came across a small bug here. You can probably just change this in the source branch on your end. I'll need to investigate how to make sure material previews update between frame changes in rendering in a different branch. That's where this bug came from.

[saturday06]

expression.materexpression.materials_to_update is a CollectionProperty(type=PropertyGroup), but it actually needs to be a CollectionProperty(type=Material). However, Material cannot be a CollectionProperty element, so a proxy is required. I solved the problem using that proxy in the main branch.

• VRM-Addon-for-Blender/src/io_scene_vrm/editor/vrm1/property_group.py

  Lines 1120 to 1122 in 4cc2636

  	materials_to_update: CollectionProperty( # type: ignore[valid-type]
  	type=MaterialPropertyGroup, options={"HIDDEN"}
  	)

• VRM-Addon-for-Blender/src/io_scene_vrm/editor/vrm1/property_group.py

  Lines 1339 to 1346 in 4cc2636

  	for material_property_group in expression.materials_to_update:
  	material = material_property_group.material
  	if not material:
  	continue
  	node_tree = material.node_tree
  	if not node_tree:
  	continue
  	node_tree.update()

• VRM-Addon-for-Blender/src/io_scene_vrm/editor/vrm1/ops.py

  Line 1307 in 5a6b2af

  new_item.material = material