Merge pull request #1679 from ramox81/codex/surface-associativity-sources

Associative extruded, revolved and lofted surfaces; spline and ellipse sources

# Conflicts:
#	src/app/command_driver/solid3d.rs
#	src/scene/dwg_native_constraints.rs
#	src/scene/model/mod.rs
#	src/scene/model/sweep_command_model.rs
#	src/scene/model/sweep_model.rs
#	src/scene/modify.rs

src/scene/model/solid_history.rs

@@ -850,8 +850,11 @@ pub fn extrusion_surface_data(value: &SolidHistorySweep) -> Option<codec::entiti
         sweep_entity: Some(profile),
         options: SurfaceSweepOptions {
             draft_angle: value.draft_angle,
-            draft_start_distance: value.start_draft_distance,
-            draft_end_distance: value.end_draft_distance,
+            // The reference keeps no draft distances on an extruded
+            // surface; a distance there reads as a taper when it
+            // re-extrudes the surface from a changed profile.
+            draft_start_distance: 0.0,
+            draft_end_distance: 0.0,
             twist_angle: value.twist_angle,
             scale_factor: value.scale_factor,
             align_angle: value.align_angle,