🐛 fix: prevent Markdown stream replay when vlist remounts streaming items#14086
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…tems Long streaming replies replayed the token-by-token animation when users scrolled them out of view and back. virtua VList was recycling streaming items, so the Markdown component lost its animation state on remount. - Pin currently-streaming messages via `keepMounted` on the VList so their DOM stays mounted regardless of scroll position. - Scope the `animated` flag to the last answer segment inside an AssistantGroup. Finalized blocks now render as static markdown, so any future remount cannot replay completed content.
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The store already exposes per-block streaming state via `isMessageGenerating(blockId)`: the streaming write target's DB message id (== block.id) is associated to the running operation, so finalized blocks naturally resolve to `generating=false` and the active block to `true`. The prop drilling added in the prior commit only duplicated this and did not actually prevent replay on the streaming block itself. Keep the real fix (`keepMounted` on the VList) which pins the streaming item so vlist recycling never resets the Markdown animation state in the first place.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## canary #14086 +/- ##
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Coverage 67.14% 67.14%
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Files 2133 2133
Lines 182487 182487
Branches 18823 18818 -5
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Hits 122531 122531
Misses 59831 59831
Partials 125 125
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Recycling a virtualized item whose node hosts a Selection anchor or focus silently drops the user's highlight. Track message ids that currently contain an active selection via a `selectionchange` listener and merge their indices into `keepMountedIndices` alongside the streaming pins. - New hook `useSelectionMessageIds` walks Selection range endpoints up to the nearest `[data-message-id]` host and returns a stable Set of ids, returning the previous reference when the set is unchanged. - VirtualizedList merges selection indices with streaming indices and hands the union to VList's `keepMounted`.
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Apr 27, 2026
# 🚀 LobeHub v2.1.53 (20260427) **Release Date:** April 27, 2026 **Since v2.1.52:** 194 merged PRs · 17 contributors > Introduce Heterogeneous Agent — Claude Code and Codex run as first-class desktop runtimes, paired with a new Agent Signal package, sharper desktop UX, and a wave of flagship model additions. --- ## ✨ Highlights - **Introduce Heterogeneous Agent** — Claude Code and Codex run as first-class desktop agents: subagent rendering, partial-message streaming, multi-turn resume, terminal error surfacing, rich tool inspectors, and runtime polish. (#14162, #13754, #14067, #14001, #13970, #13942) - **Screen capture & Quick Chat tray** — New desktop screen capture overlay (macOS permission-gated) with Quick Chat tray and upload pipeline improvements; chat input auto-focuses on overlay mount. (#13818, #14097, #14105) - **Desktop topic & tab UX** — Dedicated topic popup window with cross-window sync, Cmd+W/Cmd+T tab shortcuts, TabBar polish, recent working directories expanded to 20, and human approval notifications. (#13957, #13983, #13972, #14036, #14092) - **Git workflow built-in** — One-click pull/push from the branch chip, ahead/behind badge, and submodule/worktree repo detection. (#14041, #13980, #13978) - **Agent Signal package** — New `@lobechat/agent-signal` runtime for dynamic memory feedback signals, with OTel metrics and self-iteration in Lab. (#14157, #14170, #14159, #14169, #14187) - **New models** — Claude Opus 4.7 with `xhigh` effort tier, GPT-5.5, DeepSeek V4 Flash/Pro with reasoning slider, Kimi K2.6, MiMo-V2.5/Pro, gpt-image-2, Qwen3.6 Flash/Plus, and Pixverse-c1. (#13903, #14147, #14114, #14004, #14089, #14039, #13923) - **New providers** — OpenCode Zen, OpenCode Go, and Azure OpenAI Router runtime. (#13943, #14064, #13823) - **Mobile settings overhaul** — Full settings menu and responsive profile layout for mobile. (#14019) --- ## 🏗️ Heterogeneous Agent - Claude Code runtime, working-directory awareness, and sidebar polish. (#13970) - CC subagent rendering with persistent streamed text; parallel-tool orphan fix. (#14001, #13968, #14024) - Per-step usage persisted to each step assistant message. (#13964) - Per-phase workflow expand defaults; full-expand toggle with three-level expansion. (#14171, #13906) - Hetero-mode actions bar; tool inspector polish. (#13963, #14034, #14030) - Codex desktop integration with rich tool rendering and devtools preview. (#14067, #14100) - Codex terminal error surfacing and CLI output tracing. (#14166) - Tighten `isCanUseVision` default and add aggregator fallback. (#14172) - Persist `ccSessionId` in topic metadata for CC multi-turn resume. (#13902) - CC account card, topic filter, and integration polish. (#13955, #13942, #13950) - Token-level deltas streamed via `--include-partial-messages`. (#13929) --- ## 🧠 Agent Signal & Self-Iteration - New `@lobechat/agent-signal` package with dynamic feedback signals. (#14157) - AgentSignalRuntime wired through agent-tracing and observability-otel metrics. (#14170, #14159) - Self-iteration feature flag added to Lab; front-side flag check. (#14169, #14186) - Signal policy for receiving memory feedback dynamically. (#14187) --- ## 💬 Conversation - Queue follow-up sends during running CC turns. (#14179) - Persist per-topic chat scroll position; pin user message + fold long messages. (#14191, #14056) - Inline resend when editing last user message. (#14080) - Disable first-block markdown streaming to prevent flicker. (#14193, #13904) - Prevent Markdown stream replay when vlist remounts streaming items. (#14086) - Stop repinning after manual scroll; unify scroll-to-user + spacer hooks. (#14099, #14132) --- ## 📱 Platforms & Integrations ### Desktop / Electron - Screen capture overlay, Quick Chat tray, and upload pipeline improvements. (#13818) - macOS permission gate for screen capture; auto-focus chat panel input. (#14097, #14105) - Dedicated topic popup window with cross-window sync. (#13957) - TabBar polish: `+` button for new topic, dark theme blend, close icon by default. (#13972, #14203, #13973) - Recent working directories expanded from 5 to 20; submodule/worktree repo detection. (#14036, #13978) - Cmd+W / Cmd+T tab shortcuts and global shortcut consolidation. (#13983, #13880) - Linux icon configuration; human approval desktop notifications. (#14042, #14092) ### Git Workflow - One-click pull/push from branch chip; ahead/behind badge with refactored GitCtr. (#14041, #13980) ### Mobile - Full settings menu and responsive profile layout. (#14019) - Agent route added to mobile router; mobile agent topic route registered. (#14103, #14158) - Session list skeleton row layout corrected. (#14040) ### Bot / Messaging - DM strategy support; bot emoji and markdown render optimization. (#14201, #14091, #14140) - Slack webhook fix; bot platform setup guide reference. (#14052, #14121) --- ## 🤖 Models & Providers ### New models - **Claude Opus 4.7** with `xhigh` effort tier; strip temperature/top_p. (#13903, #13909) - **GPT-5.5**. (#14147) - **DeepSeek V4** Flash/Pro cards with reasoning slider; cache-hit and Pro discount pricing. (#14114, #14209, #14196, #14131) - **Kimi K2.6** model with LobeHub-hosted card. (#14004, #14006) - **MiMo-V2.5 / V2.5-Pro**. (#14089) - **gpt-image-2**, **Qwen3.6 Flash/Plus**, **Pixverse-c1**. (#14039, #13923) ### New providers - **OpenCode Zen** and **OpenCode Go** with env-var support. (#13943, #14064) - **Azure OpenAI Router** runtime support. (#13823) - Model alias mapping for image and video runtimes. (#13896) - Seedance video models migrated to Dreamina. (#14144) ### Runtime reliability - Sanitize invalid tool_call arguments to unbreak strict providers. (#14033) - Tolerate null `function.name` in streaming tool_call deltas. (#14139) - Preserve Gemini 3 `thoughtSignature` in `call_tools_batch` normalization. (#14032) - Downgrade `image_url` parts when target model lacks vision. (#14029) - Preserve Cloudflare provider error context. (#14136) - Use `safety_identifier` for OpenAI Responses API. (#14148) - Unwrap underlying PG error in `formatErrorEventData`. (#14038) --- ## 🖥️ User Experience - **Onboarding** — Preset agent naming suggestions, structured hunk ops for `updateDocument`, persona analytics snapshot, footer promotion pipeline, wrap-up button. (#13931, #13989, #13930, #13853, #13934) - **Document workflow** — Agent documents promoted as primary workspace panel; history management and compare workflow; web-crawl docs associated with agent documents. (#13924, #13725, #13893) - **cmdk** — Agent identity surfaced on topic search results; topic/message search scoped to current agent. (#14204, #13960) - **Floating chat panel** and workspace improvements. (#13887) - **Topic completion status** with dropdown action and filter. (#14005) --- ## 🔧 Tooling - Redis-backed feature flag provider for runtime config. (#14098) - Vite upgraded to 8.0.0 with Rolldown strict execution order. (#12720, #14058) - `@lobechat/model-bank` automated npm release with provenance. (#14015, #14017, #14018) - Skill activation fallback when `activateTools` cannot find identifier. (#14010) - Cron tool: timezone and existing jobs injected into system prompt; clarified `lobe-gtd` and `lobe-cron` descriptions. (#14012, #14013) --- ## 🔒 Security & Reliability - **Security:** uuid bumped to v14 (advisory). (#14083) - **Security:** validate avatar URL and scope old-avatar deletion to owner. (#13982) - **Security:** clear OIDC sessions on better-auth signout; return 401 (not 500) for expired OIDC JWT. (#13916, #14014) - **Reliability:** scope pending-approval check to current assistant turn. (#14182) - **Reliability:** sanitize heterogeneous-agent attachment cache filenames. (#13937) - **Reliability:** reduce subagent task status error noise. (#14026) --- ## 👥 Contributors Huge thanks to **17 contributors** who shipped **194 merged PRs** this week. @hardy · @shaun0927 · @hezhijie0327 · @sxjeru · @arvinxx · @Innei · @tjx666 · @lijian · @neko · @rdmclin2 · @AmAzing129 · @sudongyuer · @CanisMinor · @rivertwilight Plus @lobehubbot and renovate[bot] for maintenance. --- **Full Changelog**: v2.1.52...v2.1.53
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💻 Change Type
🔀 Description of Change
Long streaming assistant replies replayed their token-by-token Markdown animation whenever users scrolled them out of view and back in. Root cause: virtua's `VList` recycles off-screen items, so the streaming `MarkdownMessage` lost its animation state on remount and replayed from the beginning.
Fix: pin currently-streaming items in the vlist via `keepMounted`.
🧪 How to Test
`bunx vitest run 'src/features/Conversation/Messages/AssistantGroup'` → 27/27 pass.
📸 Screenshots / Videos
N/A (visual behavior only — no DOM structure change).
📝 Additional Information