Fix missing ID tag when converting objects

Parenting to a curve path animation depends on both geometry and
transform components. Conversion of mesh to curve will make it so
parent have path animation, conversion of curve to mesh makes it
so there is no more path animation. Both cases affects children
of the converted objects, and it's not possible to rely on special
case for curve parent in the dependency graph as that link will be
lost after conversion of curve to mesh.

Simplest approach is to tag object for both geometry and transform
update, which will ensure all children are at valid state after
the conversion.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/editors/object/object_add.c b/source/blender/editors/object/object_add.c
index 4a229ae741f..0e609b5e903 100644
--- a/source/blender/editors/object/object_add.c
+++ b/source/blender/editors/object/object_add.c
@@ -2540,7 +2540,12 @@ static int convert_exec(bContext *C, wmOperator *op)
     }
 
     if (!keep_original && (ob->flag & OB_DONE)) {
-      DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
+      /* NOTE: Tag transform for update because object parenting to curve with path is handled
+       * differently from all other cases. Converting curve to mesh and mesh to curve will likely
+       * affect the way children are evaluated.
+       * It is not enough to tag only geometry and rely on the curve parenting relations because
+       * this relation is lost when curve is converted to mesh. */
+      DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY | ID_RECALC_TRANSFORM);
       ((ID *)ob->data)->tag &= ~LIB_TAG_DOIT; /* flag not to convert this datablock again */
     }
   }