Reset selected commit and fiber between profiling sessions

src/devtools/views/Profiler/ProfilerContext.js

@@ -124,6 +124,15 @@ function ProfilerContextController({ children }: Props) {
 
   const [selectedFiberID, selectFiber] = useState<number | null>(null);
 
+  if (isProfiling) {
+    if (selectedFiberID !== null) {
+      selectFiber(null);
+    }
+    if (selectedCommitIndex !== null) {
+      setSelectedCommitIndex(null);
+    }
+  }
+
   const value = useMemo(
     () => ({
       hasProfilingData,

src/devtools/views/Profiler/SnapshotSelector.js

@@ -56,7 +56,8 @@ export default function SnapshotSelector(_: Props) {
   }, [filteredCommitIndices, selectedCommitIndex]);
 
   // TODO (profiling) This should be managed by the context controller (reducer).
-  // TODO (profiling) We should also reset the selected index to 0 between profiling sessions.
+  // It doesn't currently know about the filtered commits though (since it doesn't suspend).
+  // Maybe this component should pass filteredCommitIndices up?
   if (selectedFilteredCommitIndex === null) {
     if (numFilteredCommits > 0) {
       setSelectedCommitIndex(0);