Files
multica/packages
Naiyuan Qing 81b62fc8d3 fix(chat): eliminate Skeleton flash on new-chat first message (#2518)
In a new chat (no active session), the first send momentarily rendered
ChatMessageSkeleton before the user's message appeared. Root cause:
ensureSession called setActiveSession(newId) immediately after creating
the session, *before* handleSend wrote the optimistic message to the
chatKeys.messages(sessionId) cache. useQuery's first subscription to the
new key saw no data → isLoading=true → showSkeleton rendered for one
frame.

Apply TanStack Query's "seed the cache before subscription" pattern:
move setActiveSession out of ensureSession and into the callers, after
they've primed the messages cache. handleSend writes the optimistic
user message first, then flips activeSessionId; handleUploadFile seeds
an empty array first, then flips. useQuery's first read hits cache
synchronously and ChatMessageList mounts directly — no Skeleton frame.

This is a distinct race from the chat-done flicker fixed in #2509
(unmount/mount on reply completion); both share the same prime-before-
subscribe shape.

Co-authored-by: multica-agent <github@multica.ai>
2026-05-13 15:55:59 +08:00
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