Add back previous checks

packages/react/focus-scope/src/FocusScope.tsx

@@ -108,13 +108,27 @@ const FocusScope = React.forwardRef<FocusScopeElement, FocusScopeProps>((props,
       // When the focused element gets removed from the DOM, browsers move focus
       // back to the document.body. In this case, we move focus to the container
       // to keep focus trapped correctly.
-      function handleMutations() {
+      function handleMutations(mutations: MutationRecord[]) {
+        // If the activeElement is not the document body, then the focus was not
+        // lost, so we don't need to rescue the focus.  Please note that this is
+        // not perfectly robust, because the active element can still be
+        // document.body even in some cases where the focus was not lost.  For
+        // example, during a blur event, browsers set the activeElement to
+        // document.body just before activeElement may be set to the next
+        // element
+        if (document.activeElement !== document.body) return;
+
+        // If no elements were removed, then we don't need to rescue focus
+        if (noElementsRemoved(mutations)) return;
+
+        // If the last focused element is still in the container, then it wasn't
+        // removed and we don't need to rescue focus
         const lastFocusedElementStillInContainer = container?.contains(
           lastFocusedElementRef.current
         );
-        if (!lastFocusedElementStillInContainer) {
-          focus(container);
-        }
+        if (lastFocusedElementStillInContainer) return;
+
+        focus(container);
       }
 
       document.addEventListener('focusin', handleFocusIn);
@@ -343,6 +357,15 @@ function removeLinks(items: HTMLElement[]) {
   return items.filter((item) => item.tagName !== 'A');
 }
 
+function noElementsRemoved(mutations: MutationRecord[]) {
+  for (const mutation of mutations) {
+    if (mutation.removedNodes.length > 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
 const Root = FocusScope;
 
 export {