remove dead code and fix some types

src/editor/model.ts

@@ -237,7 +237,7 @@ export default class EditorModel {
                     }
                 }
             }
-            // not _autoComplete, only there if active part is autocomplete part
+            // not autoComplete, only there if active part is autocomplete part
             if (this.autoComplete) {
                 return this.autoComplete.onPartUpdate(part, pos);
             }