lei_tag: fix comments w.r.t support levels

RFC 8621 registers $flagged, $answered, $seen, $draft which
map to IMAP, Maildir, and mbox Status/X-Status flags.

$forwarded is noted in JMAP, but only Maildir and and the
"Lemonade" IMAP profile (RFC 5550) support it

diff --git a/lib/PublicInbox/LeiTag.pm b/lib/PublicInbox/LeiTag.pm
index c7a21c87dfa77eef8489b012efa87f7a6dd6a232..1dfc841d6941b2effccb33c1c2ee232bb8a3e0af 100644 (file)
--- a/lib/PublicInbox/LeiTag.pm
+++ b/lib/PublicInbox/LeiTag.pm
@@ -8,11 +8,13 @@ use v5.10.1;
 use parent qw(PublicInbox::IPC PublicInbox::LeiInput);
 
 # JMAP RFC 8621 4.1.1
-my @KW = (qw(seen answered flagged draft), # system
-       qw(forwarded phishing junk notjunk)); # reserved
+# https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
+my @KW = (qw(seen answered flagged draft), # widely-compatible
+       qw(forwarded phishing junk notjunk)); # rarely supported
 # note: RFC 8621 states "Users may add arbitrary keywords to an Email",
 # but is it good idea?  Stick to the system and reserved ones, for now.
-# The "system" ones map to Maildir flags and mbox Status/X-Status headers.
+# The widely-compatible ones map to IMAP system flags, Maildir flags
+# and mbox Status/X-Status headers.
 my %KW = map { $_ => 1 } @KW;
 my $L_MAX = 244; # Xapian term limit - length('L')