Fix T96205: Active shape key gets lost upon edit mode undo

Regression in d961adb866cc2d7a95e4c6a7f06c49e346ec1abe,
it's important that for the Mesh used for undo storage matches
the shape-key instead of using the coordinates of the Basis key.

Prior to bfdbc78466ac14d45f353db9aa39cb21bb962701 a different method of
restoring the basis shape-key coordinates was used (restoring from the
input `Mesh.mvert` array). When undo wrote the edit-mesh into the mesh
this was always NULL so the basis shape keys coordinates were never
used.

Now a parameter has been added so undo can use the active shape for the
meshes vertex coordinates.

Reviewed By: sergey

Maniphest Tasks: T96205

Ref D14258

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/editors/mesh/editmesh_undo.c b/source/blender/editors/mesh/editmesh_undo.c
index 2960070714c..3452edd51dd 100644
--- a/source/blender/editors/mesh/editmesh_undo.c
+++ b/source/blender/editors/mesh/editmesh_undo.c
@@ -615,6 +615,7 @@ static void *undomesh_from_editmesh(UndoMesh *um, BMEditMesh *em, Key *key, Undo
           .calc_object_remap = false,
           .update_shapekey_indices = false,
           .cd_mask_extra = {.vmask = CD_MASK_SHAPE_KEYINDEX},
+          .active_shapekey_to_mvert = true,
       }));
 
   um->selectmode = em->selectmode;