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[GUI] Changing the language while an answer streams freezes the shown answer; with Edit/Rewind open it deadlocks the composer

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
72/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
javascript
Domain
frontend

Research direction

Start at serve/web/app.js:1557-1558 (the language select's onchange → showLanguage), then read renderChat at lines 1548-1556 and the .st-msg recreation at 964-966. Compare with the guarded call sites (openChat/startChat/regenerateAt/undoHistory/list-toggle) to see how busy/panel are checked, and read the panel handling at chats-ui.js:341 and 391 to learn how closePanel is meant to run. Done means the language switch either refuses while busy or closes the panel safely, and generateReply's captured element at line 1209 is no longer detached mid-stream; verify with the two-click reproduction.

Written by the indexing model from the issue text.

Description

Problem: on the served web chat page, the About tab is reachable while an answer is streaming, and the language select's onchange → showLanguage() (serve/web/app.js:1557-1558) → renderChat() (lines 1548-1556) destroys and recreates every .st-msg node (lines 964-966) with NO busy/panel guard. Every other renderChat() call site guards (openChat/startChat/regenerateAt/undoHistory/list-toggle check busy/panel) — showLanguage is the only unguarded one. Two consequences: (a) generateReply keeps painting into the element it captured (line 1209), now detached — the shown answer freezes at mid-stream text until the next render (the stored chat is fine); (b) an open Edit/Rewind panel lives INSIDE the destroyed message node (chats-ui.js:341/391), so panel.el is detached while panel stays set — closePanel() is only reachable from the panel's own buttons (now gone) or New chat: the textarea and send button stay disabled ("Save or cancel what is open above to continue") with nothing on screen to cancel.

Environment:
Strata Version: 0.2.7 (source checkout at tag v0.2.7, commit 5e8a4cca; the file discussed is byte-identical to the tag)
OS: Linux x86-64
Reported from the Strata-Mnemosyne fork's merged tree; the offending code is upstream's own.

Reproduce: start a long answer → About tab → change Language → back to Chat: the answer shows frozen text until the next send. Variant: open "Rewind to here", change the language → composer disabled with no visible panel; escaping needs New chat or a reload.
Expected: the language switch behaves like the other re-renders (refuse, or close the panel safely while busy).

Reproduction status: unconfirmed static analysis (no browser on this box; call-site audit as described). What would verify: the two clicks above.

Dominant language
C++
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