fix(lsp): apply each rename edit to its own document

Assisted-by: GLM 5.3 Flash

lsp/handlers.go

@@ -229,7 +229,9 @@ func (s *Server) references(p referenceParams) []Location {
 	return out
 }
 
-// rename renames a label across the document.
+// rename renames a label across every document the references reach.  Each
+// edit is grouped under the URI it belongs to: a range collected in another
+// file must never be applied to the document that started the rename.
 func (s *Server) rename(p renameParams) *WorkspaceEdit {
 	text := s.docs[p.TextDocument.URI]
 	word, _ := wordAt(text, p.Position)
@@ -244,13 +246,11 @@ func (s *Server) rename(p renameParams) *WorkspaceEdit {
 	if len(refs) == 0 {
 		return nil
 	}
-	edits := make([]TextEdit, 0, len(refs))
+	edits := make(map[string][]TextEdit, len(refs))
 	for _, loc := range refs {
-		edits = append(edits, TextEdit{Range: loc.Range, NewText: p.NewName})
-	}
-	return &WorkspaceEdit{
-		Changes: map[string][]TextEdit{p.TextDocument.URI: edits},
+		edits[loc.URI] = append(edits[loc.URI], TextEdit{Range: loc.Range, NewText: p.NewName})
 	}
+	return &WorkspaceEdit{Changes: edits}
 }
 
 // documentFormatting returns a single edit that replaces the whole document