reuse outdated children

Author: sokra

turbopack/crates/turbo-tasks-backend/src/backend/operation/connect_child.rs

@@ -31,9 +31,15 @@ pub enum ConnectChildOperation {
 impl ConnectChildOperation {
     pub fn run(parent_task_id: TaskId, child_task_id: TaskId, mut ctx: ExecuteContext<'_>) {
         let mut parent_task = ctx.task(parent_task_id, TaskDataCategory::All);
-        parent_task.remove(&CachedDataItemKey::OutdatedChild {
-            task: child_task_id,
-        });
+        // Quick skip if the child was already connected before
+        if parent_task
+            .remove(&CachedDataItemKey::OutdatedChild {
+                task: child_task_id,
+            })
+            .is_some()
+        {
+            return;
+        }
         if parent_task.add(CachedDataItem::Child {
             task: child_task_id,
             value: (),