Add a warning about lack of devtool support

Author: lunaleaps

docs/virtualview.md

@@ -41,6 +41,11 @@ Blocking the main thread can provide a better user experience by preventing flas
 
 However, blocking the main thread also comes with tradeoffs. If an update operation, such as mounting the children of a `VirtualView`, takes too long to finish, it can now drop frames. Dropping more than a couple frames can lead to a worse user experience by making the app feel sluggish and non-responsive. Dropping too many frames may cause the operating system to display a modal indicating the app is not responsive, or it may even terminate your app!
 
+:::warning
+Devtools currently does not support debugging main thread renders. This means if you are debugging code called from `onModeChange` that is rendered on main thread, your debugger may freeze.
+:::
+
+
 ### Prerendering
 
 `VirtualView` enables you to benefit from main thread rendering while mitigating the disadvantages of dropped frames by rendering earlier before it is needed. This is called “prerendering”.