Sheet metal: a cut-out with a corner a hair beside a bend line refolds (#1095)

Edges shorter than the model tolerance are dropped from the flat cells, and the refold sews touching corners, so a cut-out across a bend line no longer fails with a degenerate edge.

crates/kernel/src/lib.rs

@@ -122,7 +122,7 @@ pub use polybool::{faceted_boolean, planar_boolean};
 pub use polyhedron::{HalfSpace, convex_polyhedron, draft, offset_faces, shell};
 pub use prism::{PLANAR_FIT_TOL, extrude_planar_regions, planar_regions_boolean};
 pub use prism_measure::certified_prism_equivalent;
-pub use sew::{EdgeSpec, FaceSpec, SurfSpec, sew};
+pub use sew::{EdgeSpec, FaceSpec, SurfSpec, sew, sew_touching};
 pub use splitface::{SplitTool, split_body, split_faces, split_faces_with_map};
 pub use step::step_export;
 pub use step_in::{ImportedBody, StepImport, StepNode, step_cache_alive, step_import, step_import_shared, step_orientation_errors, step_validate};