[PATCH v2 0/2] Fix imap-send with reordered message headers

git imap-send rejected patches sent with git send-email, such as ones fetched from lore with b4, because it expected Date before Subject.

Changes in v2:

 * Case insensitive header match according to RFC 822/2822/5322.

Harald Nordgren (2):
  imap-send: avoid leaking the tunnel command
  imap-send: accept messages with Subject before Date

 imap-send.c           | 38 ++++++++++++++++++--------------------
 t/t9001-send-email.sh | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 20 deletions(-)

base-commit: 47fdf2208c5b94c8cc01c106b8f7c85efb91c926
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-2456%2FHaraldNordgren%2Ffix%2Fimap-send-header-order-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-2456/HaraldNordgren/fix/imap-send-header-order-v2
Pull-Request: https://github.com/git/git/pull/2456

Range-diff vs v1:

 1:  0784c16134 = 1:  b170b1f6d3 imap-send: avoid leaking the tunnel command
 2:  94129fb718 ! 2:  c42827a122 imap-send: accept messages with Subject before Date
     @@ Commit message
          and git send-email writes Subject before Date.
      
          Accept the three headers in any order within the header block of each
     -    message. The copy that git send-email --imap-sent-folder pipes to
     +    message, and match their names case insensitively as RFC 5322
     +    specifies. The copy that git send-email --imap-sent-folder pipes to
          imap-send then passes the same check, so the special case added for it
          in 04133f5bc4 (send-email: add ability to send a copy of sent emails to
          an IMAP folder, 2025-08-12) is no longer needed.
     @@ imap-send.c: static void wrap_in_html(struct strbuf *msg)
      +	bool from = false, date = false, subject = false;
      +
      +	while ((line = strchr(line, '\n')) && *++line != '\n') {
     -+		if (starts_with(line, "From: "))
     ++		if (istarts_with(line, "From: "))
      +			from = true;
     -+		else if (starts_with(line, "Date: "))
     ++		else if (istarts_with(line, "Date: "))
      +			date = true;
     -+		else if (starts_with(line, "Subject: "))
     ++		else if (istarts_with(line, "Subject: "))
      +			subject = true;
      +	}
      +	return from && date && subject;