[Library] fix dedup()

- use consistent deduplicated target name
- remove shape indices per dedup

masque/test/test_library.py

@@ -259,3 +259,43 @@ def test_library_dedup_shapes_does_not_merge_custom_capped_paths() -> None:
 
     assert not lib["top"].refs
     assert len(lib["top"].shapes[(1, 0)]) == 2
+
+
+def test_library_dedup_handles_multiple_duplicate_groups() -> None:
+    from ..shapes import Circle
+
+    lib = Library()
+    pat = Pattern()
+    pat.shapes[(1, 0)] += [Circle(radius=1, offset=(0, 0)), Circle(radius=1, offset=(10, 0))]
+    pat.shapes[(2, 0)] += [Path(vertices=[[0, 0], [5, 0]], width=2), Path(vertices=[[10, 0], [15, 0]], width=2)]
+    lib["top"] = pat
+
+    lib.dedup(exclude_types=(), norm_value=1, threshold=2)
+
+    assert len(lib["top"].refs) == 2
+    assert all(len(refs) == 2 for refs in lib["top"].refs.values())
+    assert len(lib["top"].shapes[(1, 0)]) == 0
+    assert len(lib["top"].shapes[(2, 0)]) == 0
+
+
+def test_library_dedup_uses_stable_target_names_per_label() -> None:
+    from ..shapes import Circle
+
+    lib = Library()
+
+    p1 = Pattern()
+    p1.shapes[(1, 0)] += [Circle(radius=1, offset=(0, 0)), Circle(radius=1, offset=(10, 0))]
+    lib["p1"] = p1
+
+    p2 = Pattern()
+    p2.shapes[(2, 0)] += [Path(vertices=[[0, 0], [5, 0]], width=2), Path(vertices=[[10, 0], [15, 0]], width=2)]
+    lib["p2"] = p2
+
+    lib.dedup(exclude_types=(), norm_value=1, threshold=2)
+
+    circle_target = next(iter(lib["p1"].refs))
+    path_target = next(iter(lib["p2"].refs))
+
+    assert circle_target != path_target
+    assert all(isinstance(shape, Circle) for shapes in lib[circle_target].shapes.values() for shape in shapes)
+    assert all(isinstance(shape, Path) for shapes in lib[path_target].shapes.values() for shape in shapes)