Alexander Gavrilov
ea1c31a244
For some reason the Armature modifier in the Multi-Modifier mode interpreted the vertex group in a way essentially opposite to the regular mode. Moreover, this depended not on the Multi-Modifier checkbox, but on whether the mode was actually active. This fixes the flip and adds versioning code to patch old files. One difficulty is that whether the Multi-Modifier flag is valid can be different between the viewport and render. The versioning code assumes any modifier enabled in either to be active. This change is not forward compatible, so min version is also bumped. Differential Revision: https://developer.blender.org/D16787