a0acb9bd0c
The mirror modifiers merge option caused unnecessary re-ordering to the vertex array with original vertices merging into their copies. While this wasn't an error, it meant creating a 1:1 mapping from input vertices to their final output wasn't reliable (when looping over vertices first to last) as is done in BKE_editmesh_vert_coords_when_deformed. As merging in either direction is supported, keep the source meshes vertices in-order since it allows the vertex coordinates to be extracted. NOTE: Since this change introduce issues for some cases (e.g. bound modifiers like SurfaceDeform), this change is only applied to newly created modifiers, existing ones will still use the old incorrect merge behavior. Reviewed By: @brecht Maniphest Tasks: T93321, T91444 Differential Revision: https://developer.blender.org/D13355
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