[PATCH 04/14] lib-mail: message-parser-from-parts: Enforce 50 MB all-headers-max...

[PATCH 04/14] lib-mail: message-parser-from-parts: Enforce 50 MB all-headers-max-size limit

The preparsed (from-parts) header parser was not tracking
all_headers_total_size and never called message_parse_header_lower_limit(),
so the cumulative 50 MB header size limit was never applied when re-parsing
a message using cached part structure.

Fix by mirroring the same tracking that message-parser.c does in its
parse_next_header_block(): update all_headers_total_size for each parsed
header line, and call message_parse_header_lower_limit() with the remaining
budget when initialising the per-part header parser.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Gbp-Pq: Name 0004-lib-mail-message-parser-from-parts-Enforce-50-MB-all.patch