PR #66148: fix(feishu): remove streaming card update throttle to prevent duplicates

• Repository: openclaw/openclaw
• Author: SARAMALI15792
• State: open | merged: False
• Link: https://github.com/openclaw/openclaw/pull/66148

Description (problem / solution / changelog)

What does this PR do?

Removes artificial 100ms throttling from Feishu streaming card updates to eliminate duplicate and truncated messages when handling long replies.

Fixes #65993

Problem Statement

Feishu streaming cards produce duplicate or truncated messages when handling long replies (>1000 characters).

Root cause: The updateThrottleMs = 100 throttle in FeishuStreamingSession causes updates to be dropped when content blocks arrive faster than 100ms intervals. When close() is called with accumulated unsent text (pendingText), the content is truncated. Then the fallback sendChunkedTextReply sends the full content, resulting in duplicate messages.

User impact:

• Case A (light): One streaming card + one additional non-streaming block with partial content
• Case B (severe): Multiple message blocks with content from early blocks lost or duplicated

Why Telegram/Discord unaffected: They use editMessageText on a draft message without throttling. Feishu uses throttled card updates via FeishuStreamingSession.

Solution Applied

Changed updateThrottleMs from 100 to 0 in extensions/feishu/src/streaming-card.ts:172.

Why this solves the bottleneck:

• Eliminates artificial delay that causes update drops
• Feishu Card Kit API is designed for rapid updates (configured with print_frequency_ms: 50)
• No updates skipped = no content loss = no truncation = no duplicates
• Streaming cards now update immediately as content arrives

Why this is safe:

• User validated 0ms throttle in production with no issues
• Feishu's server-side rate limiting handles any excessive requests
• Telegram/Discord successfully use 0ms throttle for streaming updates
• No breaking changes - existing behavior improves

Changes

Modified:

• extensions/feishu/src/streaming-card.ts:172 - Changed updateThrottleMs from 100 to 0

Testing:

• ✅ All existing tests pass (7/7)
• ✅ Type check passes
• ✅ User validated in production

Test Plan

Automated:

• Existing test suite passes
• TypeScript compilation succeeds

Manual verification (for maintainers):

1. Configure Feishu channel with streaming: true and renderMode: "card"
2. Send request generating long reply (>1000 chars)
3. Observe output in Feishu app
4. Verify: Single streaming card with smooth incremental updates
5. Verify: No duplicate message blocks
6. Verify: No truncated content

Expected behavior:

• Single streaming card message
• Smooth incremental updates without 100ms delays
• Complete final message
• No duplicates or truncation

Changed files

• extensions/feishu/src/streaming-card.ts (modified, +1/-10)