When a mesh is shared between multiple objects, sculpting with a brush
with the Curve stroke type doesnt update normal values for the affected
nodes when using PBVH drawing. This is because when reevaluating the
depsgraph for the objects, the shared PBVH is destroyed and the nodes
are recalculated, losing the existing node flag updates.
This only occurs for the Curve stroke type because all of its stroke
steps are performed within a single call to the overall operator when
the user presses enter, unlike other brush strokes which apply on each
mouse movement.
To fix this, we simply force update the normals before destroying the
PBVH at the end of the stroke step.
Pull Request: https://projects.blender.org/blender/blender/pulls/124268
d527e3a6bd