chore: import upstream snapshot with attribution

shortcuts/mail/draft/testdata/alternative_append_text.golden.eml

@@ -0,0 +1,18 @@
+Subject: Alternative
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary=alt
+
+--alt
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello
+append
+--alt
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<p>hello</p>
+--alt--

shortcuts/mail/draft/testdata/alternative_draft.eml

@@ -0,0 +1,17 @@
+Subject: Alternative
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary=alt
+
+--alt
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello
+--alt
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<p>hello</p>
+--alt--

shortcuts/mail/draft/testdata/alternative_set_body.golden.eml

@@ -0,0 +1,17 @@
+Subject: Alternative
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary=alt
+
+--alt
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+updated body
+--alt
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<div>updated <strong>body</strong></div>
+--alt--

shortcuts/mail/draft/testdata/calendar_draft.eml

@@ -0,0 +1,23 @@
+Subject: Meeting invite
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary=alt
+
+--alt
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+Team sync invite
+--alt
+Content-Type: text/calendar; charset=UTF-8; method=REQUEST
+Content-Transfer-Encoding: 7bit
+
+BEGIN:VCALENDAR
+VERSION:2.0
+METHOD:REQUEST
+BEGIN:VEVENT
+SUMMARY:Team Sync
+END:VEVENT
+END:VCALENDAR
+--alt--

shortcuts/mail/draft/testdata/custom_header_draft.eml

@@ -0,0 +1,10 @@
+Subject: Custom
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+X-Trace-ID: abc123
+X-Feature-Flag: on
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello

shortcuts/mail/draft/testdata/custom_header_set_subject.golden.eml

@@ -0,0 +1,10 @@
+Subject: Updated custom
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+X-Trace-ID: abc123
+X-Feature-Flag: on
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello

shortcuts/mail/draft/testdata/dirty_multipart_preamble.eml

@@ -0,0 +1,24 @@
+Subject: Dirty multipart
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+X-Trace: first
+ second
+MIME-Version: 1.0
+cOnTeNt-TyPe: multipart/mixed; boundary=mix
+
+This is a preamble line.
+Still preamble.
+--mix
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello
+--mix
+Content-Type: application/octet-stream; name=data.bin
+Content-Disposition: attachment; filename=data.bin
+Content-Transfer-Encoding: base64
+
+YQ==
+--mix--
+This is an epilogue line.
+Trailing dirty text.

shortcuts/mail/draft/testdata/forward_draft.eml

@@ -0,0 +1,24 @@
+Subject: Fwd: report
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary=mix
+
+--mix
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello
+--mix
+Content-Type: application/pdf; name=one.pdf
+Content-Disposition: attachment; filename=one.pdf
+Content-Transfer-Encoding: base64
+
+b25l
+--mix
+Content-Type: application/pdf; name=two.pdf
+Content-Disposition: attachment; filename=two.pdf
+Content-Transfer-Encoding: base64
+
+dHdv
+--mix--

shortcuts/mail/draft/testdata/forward_remove_attachment.golden.eml

@@ -0,0 +1,18 @@
+Subject: Fwd: report
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary=mix
+
+--mix
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello
+--mix
+Content-Type: application/pdf; name=one.pdf
+Content-Disposition: attachment; filename=one.pdf
+Content-Transfer-Encoding: base64
+
+b25l
+--mix--

shortcuts/mail/draft/testdata/html_inline_draft.eml

@@ -0,0 +1,19 @@
+Subject: Inline draft
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/related; boundary=rel
+
+--rel
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<div>hello<img src="cid:logo"></div>
+--rel
+Content-Type: image/png; name=logo.png
+Content-Disposition: inline; filename=logo.png
+Content-ID: <logo>
+Content-Transfer-Encoding: base64
+
+aGVsbG8=
+--rel--

shortcuts/mail/draft/testdata/html_inline_remove.golden.eml

@@ -0,0 +1,12 @@
+Subject: Inline draft
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/related; boundary=rel
+
+--rel
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<div>updated without image</div>
+--rel--

shortcuts/mail/draft/testdata/html_inline_replace.golden.eml

@@ -0,0 +1,19 @@
+Subject: Inline draft
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/related; boundary=rel
+
+--rel
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<div>updated<img src="cid:logo"></div>
+--rel
+Content-Type: image/png; name=logo.png
+Content-Disposition: inline; filename=logo.png
+Content-ID: <logo>
+Content-Transfer-Encoding: base64
+
+aGVsbG8=
+--rel--

shortcuts/mail/draft/testdata/html_inline_replace_binary.golden.eml

@@ -0,0 +1,19 @@
+Subject: Inline draft
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/related; boundary=rel
+
+--rel
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<div>hello<img src="cid:logo"></div>
+--rel
+Content-Type: image/png; name=logo.png
+Content-Disposition: inline; filename=logo.png
+Content-ID: <logo>
+Content-Transfer-Encoding: base64
+
+iVBORw0KGgo=
+--rel--

shortcuts/mail/draft/testdata/message_rfc822_draft.eml

@@ -0,0 +1,24 @@
+Subject: Forwarded thread
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary=mix
+
+--mix
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+See forwarded message
+--mix
+Content-Type: message/rfc822; name=forwarded.eml
+Content-Disposition: attachment; filename=forwarded.eml
+Content-Transfer-Encoding: 7bit
+
+Subject: Inner message
+From: Carol <carol@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+
+inner body
+--mix--

shortcuts/mail/draft/testdata/multipart_signed_draft.eml

@@ -0,0 +1,18 @@
+Subject: Signed draft
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/signed; boundary=sig; protocol="application/pkcs7-signature"; micalg=sha-256
+
+--sig
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+signed body
+--sig
+Content-Type: application/pkcs7-signature; name=smime.p7s
+Content-Disposition: attachment; filename=smime.p7s
+Content-Transfer-Encoding: base64
+
+c2lnbmF0dXJl
+--sig--

shortcuts/mail/draft/testdata/reply_draft.eml

@@ -0,0 +1,11 @@
+Subject: Original reply
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+Message-ID: <draft-1@example.com>
+In-Reply-To: <orig-1@example.com>
+References: <root@example.com> <orig-1@example.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello

shortcuts/mail/draft/testdata/reply_draft_subject.golden.eml

@@ -0,0 +1,11 @@
+Subject: Updated reply
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+Message-ID: <draft-1@example.com>
+In-Reply-To: <orig-1@example.com>
+References: <root@example.com> <orig-1@example.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+hello

shortcuts/mail/draft/testdata/reply_draft_with_inline_attachment.eml

@@ -0,0 +1,28 @@
+Subject: Original reply
+From: Alice <alice@example.com>
+To: Bob <bob@example.com>
+Message-ID: <draft-1@example.com>
+In-Reply-To: <orig-1@example.com>
+References: <root@example.com> <orig-1@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/related; boundary=rel
+
+--rel
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+<div>hello<img src="cid:logo"></div>
+--rel
+Content-Type: image/png; name=logo.png
+Content-Disposition: inline; filename=logo.png
+Content-ID: <logo>
+Content-Transfer-Encoding: base64
+
+aGVsbG8=
+--rel
+Content-Type: application/pdf; name=report.pdf
+Content-Disposition: attachment; filename=report.pdf
+Content-Transfer-Encoding: base64
+
+cmVwb3J0
+--rel--