Precompute canonical paths before sorting

internal/engine/overlay_test.go

@@ -117,3 +117,26 @@ func TestOwnedOverlayKeepsCompositeContributorsAndAcquiredInputs(t *testing.T) {
 		t.Fatal("working tree mutation changed an acquired input")
 	}
 }
+
+func TestDisplacedOriginsSortEscapedPointers(t *testing.T) {
+	input := parseCompositionDocument(t, "source-1", `values:
+  z: old
+  a/b: slash
+  a~b: tilde
+  nested: {x: old}
+`)
+	composed, diagnostics := composeDocuments(input)
+	if len(diagnostics) != 0 {
+		t.Fatal(diagnostics)
+	}
+	displaced := displacedOrigins(composed.root, composed.origins, Path{})
+	want := []string{"", "/values", "/values/a~0b", "/values/a~1b", "/values/nested", "/values/nested/x", "/values/z"}
+	if len(displaced) != len(want) {
+		t.Fatalf("displaced definitions = %d, want %d", len(displaced), len(want))
+	}
+	for i, definition := range displaced {
+		if got := definition.path.String(); got != want[i] {
+			t.Fatalf("displaced[%d] path = %q, want %q", i, got, want[i])
+		}
+	}
+}