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fix(ui): stop stale session load from overwriting the active chat - #2328

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mesutoezdil wants to merge 2 commits into
kagent-dev:mainfrom
mesutoezdil:fix/chat-session-switch-race
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fix(ui): stop stale session load from overwriting the active chat#2328
mesutoezdil wants to merge 2 commits into
kagent-dev:mainfrom
mesutoezdil:fix/chat-session-switch-race

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ChatInterface is not remounted when the session id prop changes, so the message-load effect for the old session keeps running after a new session is picked. If the old fetch resolves after the new one (plausible under normal network jitter), its response silently overwrites the new session's messages on screen, no error shown, wrong conversation visible.

Added a cancelled flag to the effect, same pattern already used by the neighboring effect in this file, so a stale load exits before touching state.

Added a test that reproduces the race with out of order responses, confirmed it fails against the old code and passes with the fix.

@github-actions github-actions Bot added the bug Something isn't working label Jul 25, 2026
@mesutoezdil
mesutoezdil force-pushed the fix/chat-session-switch-race branch from ee2cd8c to 05c3086 Compare August 24, 2026 13:44
ChatInterface is not remounted when the session id prop changes, so
the message-load effect for the old session keeps running after a new
session is picked. If the old fetch resolves after the new one
(plausible under normal network jitter), its response silently
overwrites the new session's messages on screen, no error shown,
wrong conversation visible.

Added a cancelled flag to the effect, same pattern already used by the
neighboring effect in this file, so a stale load exits before touching
state.

Added a test that reproduces the race with out of order responses,
confirmed it fails against the old code and passes with the fix.

Signed-off-by: mesutoezdil <mesudozdil@gmail.com>
…ch-race

Signed-off-by: mesutoezdil <mesudozdil@gmail.com>
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