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client/src/pages/TutorialTasks.tsx

@@ -179,24 +179,9 @@ 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 {}
-  };
+  // No-op container height locks (reverted)
+  const lockContainerHeightById = (_id: string) => {};
+  const unlockContainerHeightById = (_id: string) => {};
 
   // (removed) ResizeObserver scroll compensator
 
@@ -712,7 +697,6 @@ const TutorialTasks: React.FC = () => {
       lockListHeight();
       lockCardHeightById(taskId);
       lockGridHeightById(taskId);
-      lockContainerHeightById(taskId);
       withPreservedCardOffset(taskId, () => {
         setMutatingTaskId(taskId);
     setExpandedSections(prev => ({
@@ -979,7 +963,7 @@ const TutorialTasks: React.FC = () => {
                   if (isSafari) { unfreezeScroll(); }
                   disableCompensationRef.current.delete(taskId);
                 };
-                if ((afterH || 0) > 0 && (preHeight || 0) > 0 && Math.abs(afterH - preHeight) <= 1) {
+        if ((afterH || 0) > 0 && (preHeight || 0) > 0 && Math.abs(afterH - preHeight) <= 1) {
                   doUnlock();
                 } else {
                   // Gate one more frame for Safari layout to settle
@@ -992,7 +976,7 @@ const TutorialTasks: React.FC = () => {
                     const afterCardH2 = afterCard2 ? afterCard2.getBoundingClientRect().height : 0;
                     const afterH2 = afterGridH2 > 0 ? afterGridH2 : (afterContH2 > 0 ? afterContH2 : afterCardH2);
                     try { console.log('[Trace] Submit:unlockGate2', { taskId, preHeight, afterH2, afterGridH2, afterContH2, afterCardH2 }); } catch {}
-                    if ((afterH2 || 0) > 0 && (afterH || 0) > 0 && Math.abs(afterH2 - afterH) <= 1) {
+            if ((afterH2 || 0) > 0 && (preHeight || 0) > 0 && Math.abs(afterH2 - preHeight) <= 1) {
                       doUnlock();
                     } else {
                       // Fallback: still unlock to prevent permanent lock, but note trace