fix: don't play add/remove anim on old delegates

modules/sidebar/NotifGroupList.qml

@@ -80,8 +80,8 @@ LazyListView {
             LazyListView.visibleHeight: modelData?.closed || previewHidden ? 0 : notifInner.implicitHeight
             implicitHeight: notifInner.implicitHeight
 
-            opacity: LazyListView.removing || modelData?.closed || previewHidden || LazyListView.adding ? 0 : 1
+            opacity: previewHidden || LazyListView.adding ? 0 : 1
-            scale: LazyListView.removing || previewHidden ? 0.7 : LazyListView.adding ? 0.7 : 1
+            scale: previewHidden || LazyListView.adding ? 0.7 : 1
 
             hoverEnabled: true
             cursorShape: notifInner.body?.hoveredLink ? Qt.PointingHandCursor : pressed ? Qt.ClosedHandCursor : undefined

plugin/src/Caelestia/Components/lazylistview.cpp

@@ -367,6 +367,12 @@ void LazyListView::updatePolish() {
     relayout();
     syncDelegates();
 
+    // Clear isNew flags — the add animation only plays for items created
+    // during the same polish cycle as their model insertion, not for
+    // delegates created later when scrolling items into the viewport.
+    for (auto& record : m_layout)
+        record.isNew = false;
+
     // Position delegates — QML Behavior on y handles the animation
     for (auto& entry : m_delegates) {
         if (!entry.item || entry.pendingRemoval || entry.pendingInsert)
@@ -652,12 +658,14 @@ LazyListView::DelegateEntry LazyListView::createDelegate(int modelIndex) {
     entry.item->setParentItem(this);
     entry.item->setWidth(width());
 
-    // Set adding = true before completeCreate so bindings see it during initial evaluation.
+    // Only set adding = true for genuinely new model items (not viewport entries).
     // Cleared on the next frame in updatePolish when the item becomes visible.
+    if (modelIndex < static_cast<int>(m_layout.size()) && m_layout[modelIndex].isNew) {
         auto* addingAttached =
             qobject_cast<LazyListViewAttached*>(qmlAttachedPropertiesObject<LazyListView>(entry.item, true));
         if (addingAttached)
             addingAttached->setAdding(true);
+    }
 
     m_delegate->completeCreate();
 
@@ -852,7 +860,7 @@ void LazyListView::onRowsInserted(const QModelIndex& parent, int first, int last
 
     const int insertCount = last - first + 1;
     // Insert new layout records
-    m_layout.insert(first, insertCount, ItemRecord{ 0, 0, false });
+    m_layout.insert(first, insertCount, ItemRecord{ 0, 0, false, true });
 
     // Shift existing delegate indices
     QHash<int, DelegateEntry> shifted;

plugin/src/Caelestia/Components/lazylistview.hpp

@@ -169,6 +169,7 @@ private:
         qreal targetY = 0;
         qreal height = 0;
         bool heightKnown = false;
+        bool isNew = false;
     };
 
     struct DelegateEntry {