Don't send erc-sasl-user as USER command argument

* lisp/erc/erc-sasl.el (erc-sasl--send-cap-ls): Add internal switch
for sending an opening "CAP LS".  The rationale for not enabling this
by default is twofold: one, it more strongly implies that ERC supports
IRCv3 client capability negotiation, which is somewhat disingenuous;
and, two, We'd still be "faking it" by firing and forgetting, and more
balls in the air makes things less predictable.
(erc--register-connection): Possibly send a "CAP LS" before anything
depending on the value of `erc-sasl--send-cap-ls'.  Also, don't
attempt to send `erc-session-username' when it holds an SASL username
because the latter may contain protocol-defying characters.
* test/lisp/erc/resources/base/local-modules/fourth.eld: change user
parameter of "USER" command to reflect nick when `erc-sasl-user' is
set to `:user'.  (Bug#59976.)

1 files changed, 1 insertions, 1 deletions

diff --git a/test/lisp/erc/resources/base/local-modules/fourth.eld b/test/lisp/erc/resources/base/local-modules/fourth.eld
index fd6d62b6cc2..4ac5dcbd38b 100644
--- a/test/lisp/erc/resources/base/local-modules/fourth.eld
+++ b/test/lisp/erc/resources/base/local-modules/fourth.eld
@@ -1,7 +1,7 @@
 ;; -*- mode: lisp-data; -*-
 ((cap 10 "CAP REQ :sasl"))
 ((nick 10 "NICK tester`"))
-((user 10 "USER tester 0 * :tester"))
+((user 10 "USER tester` 0 * :tester"))
 
 ((authenticate 10 "AUTHENTICATE PLAIN")
  (0.0 ":irc.foonet.org CAP * ACK sasl")