Address an independent c-review of the files-from/filter feature:
- .rsync-filter precedence now matches rsync: evaluate the innermost
(current) directory's rules first, then ancestors, then the command-line
base (--filter/-C), so a deeper file's '+' can re-include what a shallower
'-' excluded (regression tests in both scan modes; single-thread and -m).
- --files-from: a listed entry missing on disk and an empty list are now hard
errors surfaced pre-transfer in send_files, send_files_multithreaded,
dry-run and --list-only; '.' (whole tree) and empty listed dirs stay valid.
- scanner_path_relative now handles a transfer root of / (previously the
scanner aborted on children of /).
- Reject unsupported rsync filter syntax explicitly (no silent no-ops):
+/- modifiers other than '/' (! C s r p x) and rules beginning with ':'/'.'
/'!' (merge/dir-merge/list-clear shorthands). Docs updated.
- -0/--from0 NUL mode preserves entry bytes (no CR/LF trimming); only newline
mode trims. Absolute-entry error message no longer includes the newline.
- --no-from0/--no-cvs-exclude registered as negatable booleans.
- RSYNC_COMPAT rows updated for the precedence, rejection list, NUL-mode
detail and the documented O(entries x files) scalability bound of the
allow-set (Summary unchanged: 62/3/5/1/76 = 147).
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