Hans Goudey
6d12d43a05
Under some circumstances (loading autosaves), we end up reading from files that were saved with the new mesh format (after T95965). When that happens we should skip the conversion from the old format to avoid data-loss. This will also give forward compatibility when we stop saving in the old format completely in 4.0. Here I mostly just check if the attributes in the new format already exist. Along with checking for the null status of `Mesh::mvert`, that should cover the majority of cases. Fixes T103878 Differential Revision: https://developer.blender.org/D17011