Remove DevTools dependency on Scheduler runWithPriority (#20967)

Author: Brian Vaughn

packages/react-devtools-shared/src/devtools/views/Components/TreeContext.js

@@ -34,12 +34,8 @@ import {
   useMemo,
   useReducer,
   useRef,
+  unstable_startTransition as startTransition,
 } from 'react';
-import {
-  unstable_next as next,
-  unstable_runWithPriority as runWithPriority,
-  unstable_UserBlockingPriority as UserBlockingPriority,
-} from 'scheduler';
 import {createRegExp} from '../utils';
 import {BridgeContext, StoreContext} from '../context';
 import Store from '../../store';
@@ -923,11 +919,10 @@ function TreeContextController({
 
   const dispatchWrapper = useCallback(
     (action: Action) => {
-      // Run the first update at "user-blocking" priority in case dispatch is called from a non-React event.
-      // In this case, the current (and "next") priorities would both be "normal",
-      // and suspense would potentially block both updates.
-      runWithPriority(UserBlockingPriority, () => dispatch(action));
-      next(() => dispatch({type: 'UPDATE_INSPECTED_ELEMENT_ID'}));
+      dispatch(action);
+      startTransition(() => {
+        dispatch({type: 'UPDATE_INSPECTED_ELEMENT_ID'});
+      });
     },
     [dispatch],
   );

packages/react-devtools-shell/src/app/PriorityLevels/index.js

@@ -15,7 +15,6 @@ import Hydration from './Hydration';
 import InlineWarnings from './InlineWarnings';
 import InspectableElements from './InspectableElements';
 import InteractionTracing from './InteractionTracing';
-import PriorityLevels from './PriorityLevels';
 import ReactNativeWeb from './ReactNativeWeb';
 import ToDoList from './ToDoList';
 import Toggle from './Toggle';
@@ -55,7 +54,6 @@ function mountTestApp() {
   mountHelper(ElementTypes);
   mountHelper(EditableProps);
   mountHelper(InlineWarnings);
-  mountHelper(PriorityLevels);
   mountHelper(ReactNativeWeb);
   mountHelper(Toggle);
   mountHelper(SuspenseTree);