Bug fixes.

Author: Justin Wilkerson

src/index.tsx

@@ -27,6 +27,9 @@ const customPlugin: import("./plugin/vendor/playground").PlaygroundPlugin = {
   },
   modelChangedDebounce(_, model) {
     createCustomEvent("modelChangedDebounce", model);
+  },
+  willUnmount(_, container) {
+    ReactDOM.unmountComponentAtNode(container);
   }
 };
 

src/plugin/Provider.tsx

@@ -42,10 +42,11 @@ export const Provider: React.FC<ProviderProps> = ({
   }, []);
 
   useEffect(() => {
-    sandbox.editor.onDidChangeModelDecorations(() => {
+    const disposable = sandbox.editor.onDidChangeModelDecorations(() => {
       const allMarkers = sandbox.monaco.editor.getModelMarkers({});
       setMarkers(allMarkers);
     });
+    () => disposable.dispose();
   }, []);
 
   useEffect(() => {