fix(ui): stabilize streaming follow mode

Disable follow-mode virtualization churn and simplify reasoning header layout so streaming thinking blocks stop nudging the scroll position while the list is pinned to bottom.

package-lock.json

@@ -3305,6 +3305,22 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@tauri-apps/cli-win32-x64-msvc": {
+      "version": "2.9.4",
+      "resolved": "https://registry.npmjs.org/@tauri-apps/cli-win32-x64-msvc/-/cli-win32-x64-msvc-2.9.4.tgz",
+      "integrity": "sha512-EdYd4c9wGvtPB95kqtEyY+bUR+k4kRw3IA30mAQ1jPH6z57AftT8q84qwv0RDp6kkEqOBKxeInKfqi4BESYuqg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "Apache-2.0 OR MIT",
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/@tauri-apps/plugin-notification": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/@tauri-apps/plugin-notification/-/plugin-notification-2.3.3.tgz",
@@ -12066,7 +12082,8 @@
       "version": "0.12.2",
       "license": "MIT",
       "devDependencies": {
-        "@tauri-apps/cli": "^2.9.4"
+        "@tauri-apps/cli": "^2.9.4",
+        "@tauri-apps/cli-win32-x64-msvc": "^2.9.4"
       }
     },
     "packages/ui": {

packages/tauri-app/package.json

@@ -13,6 +13,7 @@
     "build": "tauri build"
   },
   "devDependencies": {
-    "@tauri-apps/cli": "^2.9.4"
+    "@tauri-apps/cli": "^2.9.4",
+    "@tauri-apps/cli-win32-x64-msvc": "^2.9.4"
   }
 }

packages/tauri-app/src-tauri/src/cli_manager.rs

@@ -900,6 +900,11 @@ fn resolve_dist_entry(_app: &AppHandle) -> Option<String> {
 
     if let Ok(exe) = std::env::current_exe() {
         if let Some(dir) = exe.parent() {
+            candidates.push(Some(dir.join("resources/server/dist/bin.js")));
+            candidates.push(Some(dir.join("resources/server/dist/index.js")));
+            candidates.push(Some(dir.join("resources/server/dist/server/bin.js")));
+            candidates.push(Some(dir.join("resources/server/dist/server/index.js")));
+
             let resources = dir.join("../Resources");
             candidates.push(Some(resources.join("server/dist/bin.js")));
             candidates.push(Some(resources.join("server/dist/index.js")));
@@ -995,9 +1000,18 @@ fn first_existing(paths: Vec<Option<PathBuf>>) -> Option<String> {
 }
 
 fn normalize_path(path: PathBuf) -> String {
-    if let Ok(clean) = path.canonicalize() {
-        clean.to_string_lossy().to_string()
+    let resolved = if let Ok(clean) = path.canonicalize() {
+        clean
     } else {
-        path.to_string_lossy().to_string()
+        path
+    };
+
+    let rendered = resolved.to_string_lossy().to_string();
+    if let Some(stripped) = rendered.strip_prefix("\\\\?\\UNC\\") {
+        format!("\\\\{}", stripped)
+    } else if let Some(stripped) = rendered.strip_prefix("\\\\?\\") {
+        stripped.to_string()
+    } else {
+        rendered
     }
 }

packages/ui/src/components/message-block.tsx

@@ -578,7 +578,6 @@ export default function MessageBlock(props: MessageBlockProps) {
   const record = createMemo(() => props.store().getMessage(props.messageId))
   const messageInfo = createMemo(() => props.store().getMessageInfo(props.messageId))
   const sessionCache = getSessionRenderCache(props.instanceId, props.sessionId)
-
   const isDeleteMessageHovered = () => {
     const hover = props.deleteHover?.() ?? ({ kind: "none" } as DeleteHoverState)
 
@@ -1290,12 +1289,6 @@ function ReasoningCard(props: ReasoningCardProps) {
   const [deletingUpTo, setDeletingUpTo] = createSignal(false)
   const isSelectedForDeletion = () => Boolean(props.selectedMessageIds?.().has(props.messageId))
 
-  let headerEl: HTMLDivElement | undefined
-  let actionsEl: HTMLDivElement | undefined
-  let primaryEl: HTMLSpanElement | undefined
-  let metaMeasureEl: HTMLSpanElement | undefined
-  const [showMetaInline, setShowMetaInline] = createSignal(true)
-
   createEffect(() => {
     setExpanded(Boolean(props.defaultExpanded))
   })
@@ -1323,33 +1316,6 @@ function ReasoningCard(props: ReasoningCardProps) {
 
   const hasMeta = () => Boolean(props.showAgentMeta && (agentIdentifier() || modelIdentifier()))
 
-  const updateMetaLayout = () => {
-    if (!hasMeta()) return
-    if (!headerEl || !actionsEl || !primaryEl || !metaMeasureEl) return
-
-    const headerWidth = headerEl.getBoundingClientRect().width
-    const actionsWidth = actionsEl.getBoundingClientRect().width
-    const primaryWidth = primaryEl.getBoundingClientRect().width
-    const metaWidth = metaMeasureEl.getBoundingClientRect().width
-
-    const availableLeft = Math.max(0, headerWidth - actionsWidth - 12)
-    setShowMetaInline(primaryWidth + metaWidth + 8 <= availableLeft)
-  }
-
-  createEffect(() => {
-    if (!hasMeta() || typeof ResizeObserver === "undefined") {
-      setShowMetaInline(true)
-      return
-    }
-
-    updateMetaLayout()
-    const observer = new ResizeObserver(() => updateMetaLayout())
-    if (headerEl) observer.observe(headerEl)
-    if (actionsEl) observer.observe(actionsEl)
-    if (primaryEl) observer.observe(primaryEl)
-    onCleanup(() => observer.disconnect())
-  })
-
   const reasoningText = () => {
     const part = props.part as any
     if (!part) return ""
@@ -1428,7 +1394,7 @@ function ReasoningCard(props: ReasoningCardProps) {
 
   return (
     <div class="delete-hover-scope message-reasoning-card">
-      <div class="message-reasoning-header" ref={(el) => (headerEl = el)}>
+      <div class="message-reasoning-header">
         <button
           type="button"
           class="message-reasoning-toggle"
@@ -1437,7 +1403,7 @@ function ReasoningCard(props: ReasoningCardProps) {
           aria-label={expanded() ? t("messageBlock.reasoning.collapseAriaLabel") : t("messageBlock.reasoning.expandAriaLabel")}
         >
           <span class="message-reasoning-label">
-            <span class="message-reasoning-label-primary" ref={(el) => (primaryEl = el)}>
+            <span class="message-reasoning-label-primary">
               <Show when={props.showDeleteMessage}>
                 <input
                   class="message-select-checkbox"
@@ -1458,43 +1424,10 @@ function ReasoningCard(props: ReasoningCardProps) {
 
               <span>{t("messageBlock.reasoning.thinkingLabel")}</span>
             </span>
-
-            <Show when={hasMeta() && showMetaInline()}>
-              <span class="message-step-meta-inline">
-                <Show when={agentIdentifier()}>
-                  {(value) => (
-                    <span class="font-medium text-[var(--message-assistant-border)]">{t("messageBlock.step.agentLabel", { agent: value() })}</span>
-                  )}
-                </Show>
-                <Show when={modelIdentifier()}>
-                  {(value) => (
-                    <span class="font-medium text-[var(--message-assistant-border)]">{t("messageBlock.step.modelLabel", { model: value() })}</span>
-                  )}
-                </Show>
-              </span>
-            </Show>
-
-            <Show when={hasMeta()}>
-              <span
-                ref={(el) => (metaMeasureEl = el)}
-                class="message-step-meta-inline message-step-meta-inline--measure"
-              >
-                <Show when={agentIdentifier()}>
-                  {(value) => (
-                    <span class="font-medium text-[var(--message-assistant-border)]">{t("messageBlock.step.agentLabel", { agent: value() })}</span>
-                  )}
-                </Show>
-                <Show when={modelIdentifier()}>
-                  {(value) => (
-                    <span class="font-medium text-[var(--message-assistant-border)]">{t("messageBlock.step.modelLabel", { model: value() })}</span>
-                  )}
-                </Show>
-              </span>
-            </Show>
           </span>
         </button>
 
-        <div class="message-reasoning-actions" ref={(el) => (actionsEl = el)}>
+        <div class="message-reasoning-actions">
           <button
             type="button"
             class="message-action-button"
@@ -1543,7 +1476,7 @@ function ReasoningCard(props: ReasoningCardProps) {
         </div>
       </div>
 
-      <Show when={hasMeta() && !showMetaInline()}>
+      <Show when={hasMeta()}>
         <div class="message-reasoning-meta-row">
           <span class="message-step-meta-inline">
             <Show when={agentIdentifier()}>

packages/ui/src/components/virtual-follow-list.tsx

@@ -1,5 +1,5 @@
 import { Index, Show, createEffect, createMemo, createSignal, onCleanup, type Accessor, type JSX } from "solid-js"
-import VirtualItem from "./virtual-item"
+import VirtualItem, { type VirtualItemHeightChangeMeta } from "./virtual-item"
 
 const DEFAULT_SCROLL_SENTINEL_MARGIN_PX = 48
 const USER_SCROLL_INTENT_WINDOW_MS = 600
@@ -374,7 +374,14 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
   }
 
   function handleContentRendered() {
-    scheduleAnchorScroll()
+    if (autoScroll() && !anchorLock()) {
+      scheduleAutoPinToBottom()
+      return
+    }
+    if (anchorLock() && !autoScroll()) {
+      scheduleAnchorCorrection()
+      return
+    }
   }
 
   function handleScroll() {
@@ -470,9 +477,7 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
     const bottomAfter = rect.bottom
     const bottomBefore = bottomAfter - delta
     const wasAboveViewport = bottomBefore < containerRect.top
-    if (!wasAboveViewport) {
-      return
-    }
+    if (!wasAboveViewport) return
 
     const next = (pendingScrollCompensations.get(key) ?? 0) + delta
     pendingScrollCompensations.set(key, next)
@@ -516,25 +521,51 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
   }
 
   let pendingAutoPin = false
+  let pendingAutoPinFrame: number | null = null
+
+  function clearPendingAutoPinFrame() {
+    if (pendingAutoPinFrame !== null) {
+      cancelAnimationFrame(pendingAutoPinFrame)
+      pendingAutoPinFrame = null
+    }
+  }
+
+  function applyAutoPinToBottom() {
+    if (!containerRef) return false
+    if (!autoScroll()) return false
+    if (anchorLock()) return false
+
+    const maxScrollTop = Math.max(containerRef.scrollHeight - containerRef.clientHeight, 0)
+    if (containerRef.scrollTop !== maxScrollTop) {
+      containerRef.scrollTop = maxScrollTop
+      lastKnownScrollTop = maxScrollTop
+    }
+    return true
+  }
+
   function scheduleAutoPinToBottom() {
     if (!containerRef) return
     if (pendingAutoPin) return
     pendingAutoPin = true
+    clearPendingAutoPinFrame()
     const gen = scrollCompensationGen
 
-    // Flush in a microtask so adjustments land before the next paint.
+    // Flush in a microtask so adjustments land before the next paint,
+    // then re-apply on the next two frames to catch deferred layout.
     queueMicrotask(() => {
       if (gen !== scrollCompensationGen) return
       pendingAutoPin = false
-      if (!containerRef) return
-      if (!autoScroll()) return
-      if (anchorLock()) return
-
-      const maxScrollTop = Math.max(containerRef.scrollHeight - containerRef.clientHeight, 0)
-      if (containerRef.scrollTop !== maxScrollTop) {
-        containerRef.scrollTop = maxScrollTop
-        lastKnownScrollTop = maxScrollTop
-      }
+      if (!applyAutoPinToBottom()) return
+      pendingAutoPinFrame = requestAnimationFrame(() => {
+        pendingAutoPinFrame = null
+        if (gen !== scrollCompensationGen) return
+        if (!applyAutoPinToBottom()) return
+        pendingAutoPinFrame = requestAnimationFrame(() => {
+          pendingAutoPinFrame = null
+          if (gen !== scrollCompensationGen) return
+          applyAutoPinToBottom()
+        })
+      })
     })
   }
 
@@ -623,6 +654,7 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
     pendingScrollCompensationScheduled = false
     pendingScrollCompensations = new Map()
     pendingAutoPin = false
+    clearPendingAutoPinFrame()
 
     suppressAutoScrollOnce = false
     pendingActiveScroll = false
@@ -713,7 +745,13 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
       suppressAutoScrollOnce = false
       return
     }
-    if (autoScroll()) scheduleAnchorScroll(true)
+    if (autoScroll()) {
+      scheduleAutoPinToBottom()
+      return
+    }
+    if (anchorLock() && !autoScroll()) {
+      scheduleAnchorCorrection()
+    }
   })
 
   // Drop anchor lock if the anchored key is removed.
@@ -820,6 +858,7 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
     scrollCompensationGen += 1
     pendingScrollCompensationScheduled = false
     pendingScrollCompensations = new Map()
+    clearPendingAutoPinFrame()
     clearScrollToBottomFrames()
     if (detachScrollIntentListeners) {
       detachScrollIntentListeners()
@@ -883,6 +922,7 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
             const anchorId = () => getAnchorId(key())
             const overscanPx = props.overscanPx ?? 800
             const suspendMeasurements = () => measurementsSuspended() || !isActive()
+            const itemVirtualizationEnabled = () => virtualizationEnabled() && !autoScroll()
             return (
               <VirtualItem
                 id={anchorId()}
@@ -890,9 +930,9 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
                 scrollContainer={scrollElement}
                 threshold={overscanPx}
                 placeholderClass="message-stream-placeholder"
-                virtualizationEnabled={virtualizationEnabled}
+                virtualizationEnabled={itemVirtualizationEnabled}
                 suspendMeasurements={suspendMeasurements}
-                onHeightChange={(nextHeight, previousHeight) => {
+                onHeightChange={(nextHeight, previousHeight, meta: VirtualItemHeightChangeMeta) => {
                   const delta = nextHeight - previousHeight
 
                   // Follow mode: keep the viewport pinned to the bottom as
@@ -913,12 +953,11 @@ export default function VirtualFollowList<T>(props: VirtualFollowListProps<T>) {
                   // while scrolling upward, compensate scrollTop so visible
                   // content stays stable.
                   if (delta) {
+                    if (meta.isStaleCacheCorrection) return
                     scheduleScrollCompensation(key(), delta)
                   }
                 }}
-              >
-                {() => props.renderItem(item(), index)}
-              </VirtualItem>
+              >{() => props.renderItem(item(), index)}</VirtualItem>
             )
           }}
         </Index>

packages/ui/src/components/virtual-item.tsx

@@ -167,10 +167,17 @@ interface VirtualItemProps {
   forceVisible?: Accessor<boolean>
   suspendMeasurements?: Accessor<boolean>
   onMeasured?: () => void
-  onHeightChange?: (nextHeight: number, previousHeight: number) => void
+  onHeightChange?: (nextHeight: number, previousHeight: number, meta: VirtualItemHeightChangeMeta) => void
   id?: string
 }
 
+export interface VirtualItemHeightChangeMeta {
+  source: "initial-visible-measure" | "resize"
+  previousCachedHeight: number | null
+  isStaleCacheCorrection: boolean
+  wasHidden: boolean
+}
+
 export default function VirtualItem(props: VirtualItemProps) {
   const resolveContent = () => (typeof props.children === "function" ? (props.children as () => JSX.Element)() : props.children)
   const cachedHeight = sizeCache.get(props.cacheKey)
@@ -183,10 +190,11 @@ export default function VirtualItem(props: VirtualItemProps) {
   // When content first mounts, onHeightChange deltas should reflect the DOM's
   // placeholder height (not 0), otherwise scroll compensation can overshoot.
   const [measuredHeight, setMeasuredHeight] = createSignal(cachedHeight ?? fallbackPlaceholderHeight())
-  const [hasMeasured, setHasMeasured] = createSignal(cachedHeight !== undefined)
   let hasReportedMeasurement = Boolean(cachedHeight && cachedHeight > 0)
   let pendingVisibility: boolean | null = null
   let visibilityFrame: number | null = null
+  let awaitingVisibleMeasurement = true
+  let lastMeasurementWhileHidden = true
   const flushVisibility = () => {
     if (visibilityFrame !== null) {
       cancelAnimationFrame(visibilityFrame)
@@ -210,14 +218,14 @@ export default function VirtualItem(props: VirtualItemProps) {
   }
   const virtualizationEnabled = () => (props.virtualizationEnabled ? props.virtualizationEnabled() : true)
   const measurementsSuspended = () => Boolean(props.suspendMeasurements?.())
+  const forceVisible = () => Boolean(props.forceVisible?.())
   const shouldHideContent = createMemo(() => {
-    if (props.forceVisible?.()) return false
+    if (forceVisible()) return false
     if (!virtualizationEnabled()) return false
     return !isIntersecting()
   })
- 
-   let wrapperRef: HTMLDivElement | undefined
- 
+
+  let wrapperRef: HTMLDivElement | undefined
   let contentRef: HTMLDivElement | undefined
 
   let resizeObserver: ResizeObserver | undefined
@@ -230,6 +238,17 @@ export default function VirtualItem(props: VirtualItemProps) {
     }
   }
 
+  function scheduleVisibleMeasurements() {
+    if (shouldHideContent() || measurementsSuspended()) return
+    if (!contentRef) return
+    queueMicrotask(() => {
+      if (shouldHideContent() || measurementsSuspended()) return
+      if (!contentRef) return
+      updateMeasuredHeight()
+      setupResizeObserver()
+    })
+  }
+
   function cleanupIntersectionObserver() {
     if (intersectionCleanup) {
       intersectionCleanup()
@@ -237,13 +256,24 @@ export default function VirtualItem(props: VirtualItemProps) {
     }
   }
 
-  function persistMeasurement(nextHeight: number) {
+  function persistMeasurement(nextHeight: number, meta?: { source: "initial-visible-measure" | "resize"; wasHidden: boolean }) {
     if (!Number.isFinite(nextHeight) || nextHeight < 0) {
       return
     }
     const before = measuredHeight()
     const normalized = nextHeight
-    const previous = sizeCache.get(props.cacheKey) ?? measuredHeight()
+    const previousCachedHeight = sizeCache.get(props.cacheKey) ?? null
+    const previous = previousCachedHeight ?? measuredHeight()
+    const measurementMeta: VirtualItemHeightChangeMeta = {
+      source: meta?.source ?? "resize",
+      previousCachedHeight,
+      isStaleCacheCorrection:
+        (meta?.source ?? "resize") === "initial-visible-measure" &&
+        previousCachedHeight !== null &&
+        normalized > 0 &&
+        Math.abs(normalized - previousCachedHeight) > 1,
+      wasHidden: meta?.wasHidden ?? shouldHideContent(),
+    }
     // Only keep the previous measurement when the element reports 0 height.
     // Allow shrinkage so placeholder height matches real content height;
     // keeping the max height can cause mount/unmount jitter near the
@@ -254,34 +284,40 @@ export default function VirtualItem(props: VirtualItemProps) {
         hasReportedMeasurement = true
         props.onMeasured?.()
       }
-      setHasMeasured(true)
       sizeCache.set(props.cacheKey, previous)
       setMeasuredHeight(previous)
-      if (previous !== before) props.onHeightChange?.(previous, before)
+      if (previous !== before) props.onHeightChange?.(previous, before, measurementMeta)
       return
     }
     if (normalized > 0) {
       sizeCache.set(props.cacheKey, normalized)
-      setHasMeasured(true)
       if (!hasReportedMeasurement) {
         hasReportedMeasurement = true
         props.onMeasured?.()
       }
     }
     setMeasuredHeight(normalized)
-    if (normalized !== before) props.onHeightChange?.(normalized, before)
+    if (normalized !== before) props.onHeightChange?.(normalized, before, measurementMeta)
   }
 
   function updateMeasuredHeight() {
-    if (!contentRef || measurementsSuspended()) return
+    if (!contentRef) return
+    if (measurementsSuspended()) return
     // Prefer subpixel-accurate height for scroll compensation.
     // offsetHeight rounds to integers which can accumulate error.
     const rect = contentRef.getBoundingClientRect()
     const next = Math.max(0, Math.round(rect.height * 2) / 2)
-    if (next === measuredHeight()) return
-    persistMeasurement(next)
+    const currentMeasured = measuredHeight()
+    const measurementSource: "initial-visible-measure" | "resize" = awaitingVisibleMeasurement ? "initial-visible-measure" : "resize"
+    const wasHidden = lastMeasurementWhileHidden
+    if (measurementSource === "initial-visible-measure") {
+      awaitingVisibleMeasurement = false
+      lastMeasurementWhileHidden = false
+    }
+    if (next === currentMeasured) return
+    persistMeasurement(next, { source: measurementSource, wasHidden })
   }
- 
+
   function setupResizeObserver() {
     if (!contentRef || measurementsSuspended()) return
     cleanupResizeObserver()
@@ -377,30 +413,29 @@ export default function VirtualItem(props: VirtualItemProps) {
       cleanupResizeObserver()
     }
   }
- 
-  
   createEffect(() => {
-    if (shouldHideContent() || measurementsSuspended()) {
+    const hidden = shouldHideContent()
+    if (hidden) {
+      awaitingVisibleMeasurement = true
+      lastMeasurementWhileHidden = true
+    }
+    if (hidden || measurementsSuspended()) {
       cleanupResizeObserver()
-    } else if (contentRef) {
-      queueMicrotask(() => {
-        updateMeasuredHeight()
-        setupResizeObserver()
-      })
+    }
+    if (!hidden && !measurementsSuspended() && contentRef) {
+      scheduleVisibleMeasurements()
     }
   })
 
- 
+  
   createEffect(() => {
     const key = props.cacheKey
 
     const cached = sizeCache.get(key)
     if (cached !== undefined) {
       setMeasuredHeight(cached)
-      setHasMeasured(true)
     } else {
       setMeasuredHeight(fallbackPlaceholderHeight())
-      setHasMeasured(false)
     }
   })
 
@@ -418,7 +453,7 @@ export default function VirtualItem(props: VirtualItemProps) {
     }
     return props.minPlaceholderHeight ?? MIN_PLACEHOLDER_HEIGHT
   })
- 
+
   onCleanup(() => {
     cleanupResizeObserver()
     cleanupIntersectionObserver()