[DevTools] Fix Suspense boundaries always being marked as not suspended (#34206)

packages/react-devtools-shared/src/backend/fiber/renderer.js

@@ -6071,6 +6071,11 @@ export function attach(
       nativeTag = getNativeTag(fiber.stateNode);
     }
 
+    let isSuspended: boolean | null = null;
+    if (tag === SuspenseComponent) {
+      isSuspended = memoizedState !== null;
+    }
+
     const suspendedBy =
       fiberInstance.suspenseNode !== null
         ? // If this is a Suspense boundary, then we include everything in the subtree that might suspend
@@ -6121,6 +6126,7 @@ export function attach(
           forceFallbackForFibers.has(fiber) ||
           (fiber.alternate !== null &&
             forceFallbackForFibers.has(fiber.alternate))),
+      isSuspended: isSuspended,
 
       source,
 
@@ -6209,6 +6215,7 @@ export function attach(
     const componentLogsEntry =
       componentInfoToComponentLogsMap.get(componentInfo);
 
+    const isSuspended = null;
     // Things that Suspended this Server Component (use(), awaits and direct child promises)
     const suspendedBy = virtualInstance.suspendedBy;
     const suspendedByRange = getSuspendedByRange(
@@ -6230,6 +6237,7 @@ export function attach(
       isErrored: false,
 
       canToggleSuspense: supportsTogglingSuspense && hasSuspenseBoundary,
+      isSuspended: isSuspended,
 
       source,
 

packages/react-devtools-shared/src/backend/legacy/renderer.js

@@ -836,6 +836,7 @@ export function attach(
 
       // Suspense did not exist in legacy versions
       canToggleSuspense: false,
+      isSuspended: null,
 
       source: null,
 

packages/react-devtools-shared/src/backend/types.js

@@ -285,6 +285,8 @@ export type InspectedElement = {
 
   // Is this Suspense, and can its value be overridden now?
   canToggleSuspense: boolean,
+  // If this Element is suspended. Currently only set on Suspense boundaries.
+  isSuspended: boolean | null,
 
   // Does the component have legacy context attached to it.
   hasLegacyContext: boolean,

packages/react-devtools-shared/src/backendAPI.js

@@ -251,6 +251,7 @@ export function convertInspectedElementBackendToFrontend(
     canToggleError,
     isErrored,
     canToggleSuspense,
+    isSuspended,
     hasLegacyContext,
     id,
     type,
@@ -287,6 +288,7 @@ export function convertInspectedElementBackendToFrontend(
     canToggleError,
     isErrored,
     canToggleSuspense,
+    isSuspended,
     hasLegacyContext,
     id,
     key,

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

@@ -113,7 +113,7 @@ export default function InspectedElementWrapper(_: Props): React.Node {
     element !== null &&
     element.type === ElementTypeSuspense &&
     inspectedElement != null &&
-    inspectedElement.state != null;
+    inspectedElement.isSuspended;
 
   const canToggleError =
     !hideToggleErrorAction &&

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

@@ -30,15 +30,13 @@ export default function InspectedElementSuspenseToggle({
 }: Props): React.Node {
   const {readOnly} = React.useContext(OptionsContext);
 
-  const {id, state, type} = inspectedElement;
+  const {id, isSuspended, type} = inspectedElement;
   const canToggleSuspense = !readOnly && inspectedElement.canToggleSuspense;
 
   if (type !== ElementTypeSuspense) {
     return null;
   }
 
-  const isSuspended = state !== null;
-
   const toggleSuspense = (path: any, value: boolean) => {
     const rendererID = store.getRendererIDForElement(id);
     if (rendererID !== null) {

packages/react-devtools-shared/src/frontend/types.js

@@ -264,6 +264,8 @@ export type InspectedElement = {
 
   // Is this Suspense, and can its value be overridden now?
   canToggleSuspense: boolean,
+  // If this Element is suspended. Currently only set on Suspense boundaries.
+  isSuspended: boolean | null,
 
   // Does the component have legacy context attached to it.
   hasLegacyContext: boolean,