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fix: prevent duplicate messages from SSE/poll race condition
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Deduplicate by sender+content match regardless of _optimistic flag,
preventing double display when SSE event arrives before POST response.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Maciej Pienczyn 2026-04-11 09:58:47 +02:00
parent 441fb524d1
commit f4af7709b0
1 changed files with 8 additions and 6 deletions
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12
static/js/conversations.js
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@ -775,17 +775,19 @@
var convId = msg.conversation_id;
if (!state.messages[convId]) state.messages[convId] = [];
// Dedup: skip if message with this ID already exists
// Dedup: by real ID or by matching optimistic message (same sender + content)
// Dedup: skip if message already exists by ID, content match, or time proximity
var dominated = state.messages[convId].some(function(m) {
if (m.id === msg.id) return true;
// Match optimistic msg: same sender, same stripped content
if (m._optimistic && msg.sender_id && m.sender_id === msg.sender_id) {
// Match by same sender + same stripped content (optimistic or SSE/poll race)
if (msg.sender_id && m.sender_id === msg.sender_id) {
var mc = (m.content || '').replace(/<[^>]*>/g, '').trim();
var nc = (msg.content || '').replace(/<[^>]*>/g, '').trim();
if (mc && nc && mc === nc) {
m.id = msg.id; // Update to real ID
// Update to real ID if this was optimistic
if (m._optimistic) {
m.id = msg.id;
m._optimistic = false;
}
return true;
}
}