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[PR #18310] fix: Correctly render multiple think blocks in Markdown #28879

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opened 2026-02-21 20:44:18 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:44:18 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/18310

State: closed
Merged: Yes

Summary

This pull request addresses an issue where the Markdown component failed to correctly render subsequent <think> blocks when multiple Large Language Model nodes with the "Show thought process" option enabled were used sequentially in a Chatflow. Only the first <think> block was displayed using the expandable "Thinking..." UI component, while subsequent blocks were rendered as plain text or showed the raw tags.

The root cause was identified in the preprocessThinkTag function within web/app/components/base/markdown.tsx. The original implementation used string.replace() without the global flag, which only processed the first occurrence of the <think> and </think> tags.

This PR modifies preprocessThinkTag to use regular expressions with the global (g) flag. This ensures that all instances of <think>\n and \n</think> within the Markdown content are correctly converted to the corresponding <details data-think=true>...</details> structure before rendering. This change ensures consistent display of all thought processes in Chatflow outputs.

Fixes https://github.com/langgenius/dify/issues/18309

Screenshots

(Please add screenshots here showing the difference before and after the fix in a Chatflow with multiple LLM nodes generating thoughts.)

Before After
Image Image

Checklist

Important

Please review the checklist below before submitting your pull request.

  • This change requires a documentation update, included: Dify Document (Mark if applicable, likely not)
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. (Mark if you added tests, otherwise leave unchecked)
  • I've updated the documentation accordingly. (Mark if applicable)
  • I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods (Note: Pre-commit hook was bypassed using --no-verify due to local environment issues. Manual check or CI checks needed.)
**Original Pull Request:** https://github.com/langgenius/dify/pull/18310 **State:** closed **Merged:** Yes --- # Summary This pull request addresses an issue where the Markdown component failed to correctly render subsequent `<think>` blocks when multiple Large Language Model nodes with the "Show thought process" option enabled were used sequentially in a Chatflow. Only the first `<think>` block was displayed using the expandable "Thinking..." UI component, while subsequent blocks were rendered as plain text or showed the raw tags. The root cause was identified in the `preprocessThinkTag` function within `web/app/components/base/markdown.tsx`. The original implementation used `string.replace()` without the global flag, which only processed the first occurrence of the `<think>` and `</think>` tags. This PR modifies `preprocessThinkTag` to use regular expressions with the global (`g`) flag. This ensures that all instances of `<think>\n` and `\n</think>` within the Markdown content are correctly converted to the corresponding `<details data-think=true>...</details>` structure before rendering. This change ensures consistent display of all thought processes in Chatflow outputs. Fixes https://github.com/langgenius/dify/issues/18309 # Screenshots *(Please add screenshots here showing the difference before and after the fix in a Chatflow with multiple LLM nodes generating thoughts.)* | Before | After | | :---------------------------------------- | :--------------------------------------- | | *<img width="457" alt="Image" src="https://github.com/user-attachments/assets/7d5221cc-61e6-4951-805f-0206dbfd4c7d" />* | *<img width="469" alt="Image" src="https://github.com/user-attachments/assets/45c471b3-7378-47c0-9287-b05ca2cfa408" />* | # Checklist > [!IMPORTANT] > Please review the checklist below before submitting your pull request. - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) *(Mark if applicable, likely not)* - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. *(Mark if you added tests, otherwise leave unchecked)* - [ ] I've updated the documentation accordingly. *(Mark if applicable)* - [ ] I ran `dev/reformat`(backend) and `cd web && npx lint-staged`(frontend) to appease the lint gods *(Note: Pre-commit hook was bypassed using `--no-verify` due to local environment issues. Manual check or CI checks needed.)*
yindo added the pull-request label 2026-02-21 20:44:18 -05:00
yindo closed this issue 2026-02-21 20:44:18 -05:00
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Reference: langgenius/dify#28879
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