fix: update viewport coords correctly when editing text (#4416)

src/components/App.tsx

@@ -1916,7 +1916,10 @@ class App extends React.Component<AppProps, AppState> {
           },
           this.state,
         );
-        return [viewportX, viewportY];
+        return [
+          viewportX - this.state.offsetLeft,
+          viewportY - this.state.offsetTop,
+        ];
       },
       onChange: withBatchedUpdates((text) => {
         updateElement(text, text, false, !element.containerId);