macOS reports editor workspaces as /var/... while sessions are stored
under /private/var/... (same for /tmp vs /private/tmp), so the lexical
normpath comparison in _normalize_cwd_for_compare treated them as
different directories and ACP history filters silently dropped a
workspace's own sessions.
Canonicalize with os.path.realpath; nonexistent paths (e.g.
WSL-translated Windows drives on a Linux host) keep the previous
lexical behavior since realpath(strict=False) is lexical for them.
1995207470