What
When an artifact's comment thread is too large to include in full, Claude Code trims it down. Previously this was a flat character cutoff across the whole rendered comment. Now each comment's header line is kept separate from its body when trimming, and any trailing partial line that matches the quoted-line prefix is removed entirely rather than left cut off mid-line.
Why
This produces cleaner, more readable truncated comment threads, avoiding jagged cutoffs in the middle of a quoted line or a header.