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Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Apr 11, 2026 0:39am

PR Summary

Medium Risk
Updates client-side chat caching and context-reset behavior, which could affect message/resource UI state during sends but is limited in scope and isolated to the frontend.

Overview
Fixes a UI regression where attached resources briefly disappeared (and mention icons lagged) when sending a message.

useChat.sendMessage now includes selected contexts in the optimistic React Query cache update for the pending user message and avoids persisting the transient streaming-file resource into cached chat history. UserInput also resets its previous-context tracking ref on submit to prevent context-removal side effects when clearing contexts.

^{Reviewed by Cursor Bugbot for commit 03c7b94. Bugbot is set up for automated code reviews on this repo. Configure here.}

Greptile Summary

This PR fixes two related symptoms in the @-mention resource flow: the resource panel disappearing briefly after a message is sent, and the mention-chip icon not rendering until streaming began. Both were caused by the same root bug — clearContexts() in handleSubmit triggered the selectedContexts effect, which compared the cleared list against prevSelectedContextsRef.current (still holding the submitted contexts), detected them as "removed", and called onContextRemove → removeResource for each one. The fix presets prevSelectedContextsRef.current = [] synchronously before clearContexts(), so the effect sees no delta and skips the spurious remove calls.

Confidence Score: 5/5

Safe to merge — targeted, minimal fix that closes the spurious removeResource call path without introducing new state invariants.

Single-line insertion that correctly exploits the existing ref-before-effect pattern. All edge cases behave correctly.

No files require special attention.

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant U as User
    participant UI as UserInput (handleSubmit)
    participant CTX as useContextManagement
    participant EFFECT as selectedContexts effect
    participant HOME as home.tsx (handleContextRemove)
    participant CHAT as use-chat.ts (removeResource)

    U->>UI: Press Enter / click Send
    UI->>CTX: clearContexts()
    Note over UI,CTX: BUG (before fix): prevSelectedContextsRef still=[workflowCtx]
    CTX-->>EFFECT: selectedContexts becomes []
    EFFECT->>EFFECT: prev=[workflowCtx], curr=[], removed=[workflowCtx]
    EFFECT->>HOME: onContextRemove(workflowCtx)
    HOME->>CHAT: removeResource('workflow', id)
    CHAT-->>UI: panel collapses / icon gone

    Note over UI,CTX: FIX: prevSelectedContextsRef.current=[] BEFORE clearContexts()
    UI->>UI: prevSelectedContextsRef.current = []
    UI->>CTX: clearContexts()
    CTX-->>EFFECT: selectedContexts becomes []
    EFFECT->>EFFECT: prev=[], curr=[], removed=[] — nothing to do
    Note over UI,CHAT: Resource stays in panel, icon stays visible

_{Reviews (1): Last reviewed commit: "fix(resource): fix resource view disappe..." | Re-trigger Greptile}