static/src/components/chat/ChatArea.vue

@@ -142,8 +142,7 @@
                     group.action?.streaming ||
                     group.action?.type === 'text' ||
                     group.action?.type === 'thinking',
-                  'thinking-finished': group.action?.type === 'thinking' && !group.action?.streaming,
-                  'no-entry-animation': !streamingMessage || index !== latestMessageIndex
+                  'thinking-finished': group.action?.type === 'thinking' && !group.action?.streaming
                 }"
               >
                 <div
@@ -366,8 +365,7 @@
                   'completed-tool': action.type === 'tool' && !action.streaming,
                   'immediate-show':
                     action.streaming || action.type === 'text' || action.type === 'thinking',
-                  'thinking-finished': action.type === 'thinking' && !action.streaming,
-                  'no-entry-animation': !streamingMessage || index !== latestMessageIndex
+                  'thinking-finished': action.type === 'thinking' && !action.streaming
                 }"
               >
                 <div
@@ -790,9 +788,9 @@ const {
   stopScroll
 } = useStickToBottom({
   resize: {
-    damping: 0.5,
-    stiffness: 0.28,
-    mass: 0.75
+    damping: 0.68,
+    stiffness: 0.11,
+    mass: 1.05
   },
   initial: 'instant'
 });
@@ -809,7 +807,6 @@ let lastUserWheelUpTs = 0;
 let lastProgrammaticHintTs = 0;
 let lastProgrammaticHintSource = '';
 let suppressUserIntentUntil = 0;
-let isHandlingLargeGrowth = false;
 let scrollListener: ((event: Event) => void) | null = null;
 let wheelListener: ((event: WheelEvent) => void) | null = null;
 let traceAttachLogged = false;
@@ -925,32 +922,6 @@ function attachBounceListener() {
     const heightDelta = height - lastObservedHeight;
     lastObservedTop = top;
     lastObservedHeight = height;
-
-    // 大幅高度增长检测：当 scrollHeight 突增（内容大幅展开/渲染），
-    // 且用户没有主动脱离锁定（escapedFromLock=false）时，
-    // 用 instant 瞬间追底，绕过 spring 动画的延迟。
-    // 这解决了思考块展开、Markdown 表格渲染等场景下滚动跟不上内容增长的问题。
-    const largeGrowthThreshold = Math.max(200, target.clientHeight * 0.35 || 200);
-    if (
-      !isHandlingLargeGrowth &&
-      heightDelta > largeGrowthThreshold &&
-      !escapedFromLock.value
-    ) {
-      isHandlingLargeGrowth = true;
-      markProgrammaticHint('ChatArea.largeGrowth');
-      suppressUserIntentUntil = Date.now() + 900;
-      scrollToBottom({ animation: 'instant', preserveScrollPosition: false });
-      bounceTraceLog(
-        'large-growth:instant-scroll',
-        { heightDelta, threshold: largeGrowthThreshold, ...getScrollMetrics(target) },
-        'large-growth:instant-scroll',
-        120
-      );
-      setTimeout(() => {
-        isHandlingLargeGrowth = false;
-      }, 400);
-    }
-
     const now = Date.now();
     const trusted = (event as any).isTrusted === true;
     const closeToProgrammaticHint = now - lastProgrammaticHintTs <= 140;

static/src/styles/components/chat/_chat-area.scss

@@ -766,10 +766,6 @@
   animation: slideInFade 0.6s cubic-bezier(0.4, 0, 0.2, 1) both;
 }
 
-.action-item.no-entry-animation {
-  animation: none !important;
-}
-
 .action-item.streaming-content,
 .action-item.immediate-show {
   animation: quickFadeIn 0.2s ease-out both;