After a page refresh, the artifact panel's autoOpen/autoSelect state is
reset to true. Submitting a new question flips thread.isLoading to true,
which message-list passes to every MessageGroup — including historical
ones. The previous response's last write_file step then satisfies the
auto-open condition and re-pops the stale artifact.
Gate the auto-open on the tool call having no result yet, so only a
write_file that is still streaming in the current response can trigger
it; rehydrated tool calls always carry a result and are now skipped.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Nan Gao
4d3038a7b6