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client/src/pages/TutorialTasks.tsx

@@ -179,6 +179,25 @@ const TutorialTasks: React.FC = () => {
     try { console.log('[Trace] unlockGridHeight', { id }); } catch {}
   };
 
+  // Container height lock to stabilize Safari during submit/delete
+  const lockContainerHeightById = (id: string) => {
+    const el = submissionsContainerRefs.current[id];
+    if (!el) return;
+    const h = el.getBoundingClientRect().height || lastPreHeightRef.current[id] || 0;
+    el.style.minHeight = `${h}px`;
+    el.style.height = `${h}px`;
+    el.style.overflow = 'hidden';
+    try { console.log('[Trace] lockContainerHeight', { id, h }); } catch {}
+  };
+  const unlockContainerHeightById = (id: string) => {
+    const el = submissionsContainerRefs.current[id];
+    if (!el) return;
+    el.style.overflow = '';
+    el.style.height = '';
+    el.style.minHeight = '';
+    try { console.log('[Trace] unlockContainerHeight', { id }); } catch {}
+  };
+
   // (removed) ResizeObserver scroll compensator
 
   const withPreservedCardOffset = (taskId: string, fn: () => void) => {
@@ -693,6 +712,7 @@ const TutorialTasks: React.FC = () => {
       lockListHeight();
       lockCardHeightById(taskId);
       lockGridHeightById(taskId);
+      lockContainerHeightById(taskId);
       withPreservedCardOffset(taskId, () => {
         setMutatingTaskId(taskId);
     setExpandedSections(prev => ({
@@ -954,6 +974,7 @@ const TutorialTasks: React.FC = () => {
                   unlockListHeight();
                   unlockCardHeightById(taskId);
                   unlockGridHeightById(taskId);
+                  unlockContainerHeightById(taskId);
                   pendingUnlocksRef.current.delete(taskId);
                   if (isSafari) { unfreezeScroll(); }
                   disableCompensationRef.current.delete(taskId);
@@ -988,6 +1009,7 @@ const TutorialTasks: React.FC = () => {
                 unlockListHeight();
                 unlockCardHeightById(taskId);
                 unlockGridHeightById(taskId);
+                unlockContainerHeightById(taskId);
                 pendingUnlocksRef.current.delete(taskId);
                 if (isSafari) { unfreezeScroll(); }
                 disableCompensationRef.current.delete(taskId);
@@ -1012,6 +1034,7 @@ const TutorialTasks: React.FC = () => {
         unlockListHeight();
         unlockCardHeightById(taskId);
         unlockGridHeightById(taskId);
+        unlockContainerHeightById(taskId);
         if (isSafari) { unfreezeScroll(); }
       };
       if (isSafari) {