The previous fix (8914391) only blocked the mount-time sessionStorage
restore when the page entered with prefill or ?pickup=true. It didn't
cover any path where the page was already mounted and activeChatId
flipped without the in-memory task-lane state going through reset+
repopulate cleanly — in-place URL navigation, mid-flight pickup,
HMR re-runs, the gap between setActiveChatId(B) and the AI response
that finally populates B's questions/actions.
Root cause: activeQuestions / activeActions / showTaskLane were never
intrinsically tied to a chatId. They were treated as "the active chat's
data" by convention, with no structural enforcement. Any window where
they survived past their owning chat leaked previous-session data into
the new view. The persistence effect made it worse: it stamped the
sessionStorage chatId field with activeChatId at write time, so a
mid-transition snapshot {chatId: B, questions: [A's]} would happily
restore A's data for B on the next mount.
Fix: introduce taskLaneOwnerChatId state that records the chatId those
in-memory questions/actions/show values BELONG to. Set at every site
that populates them (sendPrefill, selectChat, handleSend, handleTaskSubmit,
handleResumeNew, refreshFacts, handleApplyFix). Cleared in
resetSessionDerivedState. The persistence effect now writes ownerChatId
as the chatId tag, not activeChatId — so the snapshot is always
self-consistent.
Render gate: taskLaneIsForActiveChat = ownerChatId === activeChatId.
ANDed into all three render conditions (toolbar Tasks button, narrow-
viewport floating drawer, main side panel). The lane is structurally
unable to display data tagged with a different chat.
The mount-time skipTaskLaneRestore guard stays — it kills the flash
between component mount and the first sendPrefill effect run, which
the owner-gate alone doesn't cover.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Michael Chihlas
665530f812