🩹 Workaround buggy outlook.com address lists

Outlook.com sends an extraneous `SP` in between `address` values in its
envelope address lists: `env-{from,sender,reply-to,to,cc,bcc}`.  This
can't be parsed by the envelope performance tuning rewrite in #232, in
the v0.4.6 release.

I've had a private test for this quirk for a decade... but the test was
primarily testing a different (much stranger) BODYSTRUCTURE bug, so I
thought the extra SP was a transcription error and "fixed" the test...
Oops!

The example comes from a real response, but all addesses have been
replaced by the `faker` gem. :)

lib/net/imap/response_parser.rb

@@ -978,10 +978,16 @@ def envelope
       #   env-bcc         = "(" 1*address ")" / nil
       def nlist__address
         return if NIL?
-        lpar; list = [address]; list << address until rpar?
+        lpar; list = [address]; list << address until (quirky_SP?; rpar?)
         list
       end
 
+      # Used when servers erroneously send an extra SP.
+      #
+      # As of 2023-11-28, Outlook.com (still) sends SP
+      #   between +address+ in <tt>env-*</tt> lists.
+      alias quirky_SP? SP?
+
       alias env_from     nlist__address
       alias env_sender   nlist__address
       alias env_reply_to nlist__address

test/net/imap/fixtures/response_parser/quirky_behaviors.yml

@@ -31,3 +31,11 @@
         unparsed_data: "froopy snood"
       raw_data: "* 86 NOOP froopy snood\r\n"
 
+  outlook.com puts an extra SP in ENVELOPE address lists:
+    comment: |
+      An annoying bug from outlook.com.  They've had the bug for years, and
+      still have the bug as of 2023-11-28.
+
+      The example comes from a real response, but all addesses have been
+      replaced by the `faker` gem. :)
+    :response: "* 24 FETCH (UID 60 INTERNALDATE \"24-May-2021 11:47:51 +0200\" RFC822.SIZE 49051 ENVELOPE (\"Mon, 24 May 20 21 09:47:50 +0000\" \"Zoooom Zoom\" ((\"Augustina Gleason\" NIL \"augustina\" \"oberbrunner.test\")) NIL NIL ((\"[email protected]\" NIL \"risa\" \"harvey-lemke.test\") (\"[email protected]\" NIL \"shella\" \"kilback-renner.test\") (\"[email protected]\" NIL \"jana.kiehn\" \"bradtke-considine.example\") (\"[email protected]\" NIL \"frank\" \"hartmann.test\") (\"[email protected]\" NIL \"numbers.ryan\" \"satterfield.test\") (\"[email protected]\" NIL \"keneth_feeney\" \"will-walter.test\")) NIL NIL NIL \"<aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@bbbbbbbbbbbbb.ccccccc.PROD.OUTLOOK.COM>\"))\r\n"