Yield to erc-move-to-prompt before unhiding prompt

* lisp/erc/erc-backend.el (erc--hide-prompt): Change hook depth from 0
to 91 to allow the `move-to-prompt' module to do its thing.  This
feature was added by bug#54826 and first appeared in Emacs 29.
* lisp/erc/erc-common.el (erc-server-user): Remove erroneous comment.
The `buffers' field is a list of buffers.
* test/lisp/erc/erc-tests.el (erc-hide-prompt): Use `erc--target'
instead of `erc-default-recipients' because this is new code.

3 files changed, 18 insertions, 23 deletions

diff --git a/lisp/erc/erc-backend.el b/lisp/erc/erc-backend.el
index cf0b734bd28..567443f5329 100644
--- a/lisp/erc/erc-backend.el
+++ b/lisp/erc/erc-backend.el
@@ -883,24 +883,22 @@ Conditionally try to reconnect and take appropriate action."
     (erc--unhide-prompt)))
 
 (defun erc--hide-prompt (proc)
-  (erc-with-all-buffers-of-server
-      proc nil ; sorta wish this was indent 2
-      (when (and erc-hide-prompt
-                 (or (eq erc-hide-prompt t)
-                     ;; FIXME use `erc--target' after bug#48598
-                     (memq (if (erc-default-target)
-                               (if (erc-channel-p (car erc-default-recipients))
-                                   'channel
-                                 'query)
-                             'server)
-                           erc-hide-prompt))
-                 (marker-position erc-insert-marker)
-                 (marker-position erc-input-marker)
-                 (get-text-property erc-insert-marker 'erc-prompt))
-        (with-silent-modifications
-          (add-text-properties erc-insert-marker (1- erc-input-marker)
-                               `(display ,erc-prompt-hidden)))
-        (add-hook 'pre-command-hook #'erc--unhide-prompt-on-self-insert 0 t))))
+  (erc-with-all-buffers-of-server proc nil
+    (when (and erc-hide-prompt
+               (or (eq erc-hide-prompt t)
+                   (memq (if erc--target
+                             (if (erc--target-channel-p erc--target)
+                                 'channel
+                               'query)
+                           'server)
+                         erc-hide-prompt))
+               (marker-position erc-insert-marker)
+               (marker-position erc-input-marker)
+               (get-text-property erc-insert-marker 'erc-prompt))
+      (with-silent-modifications
+        (add-text-properties erc-insert-marker (1- erc-input-marker)
+                             `(display ,erc-prompt-hidden)))
+      (add-hook 'pre-command-hook #'erc--unhide-prompt-on-self-insert 91 t))))
 
 (defun erc-process-sentinel (cproc event)
   "Sentinel function for ERC process."
diff --git a/lisp/erc/erc-common.el b/lisp/erc/erc-common.el
index 994555acecf..0279b0a0bc4 100644
--- a/lisp/erc/erc-common.el
+++ b/lisp/erc/erc-common.el
@@ -48,9 +48,6 @@
   ;; User data
   nickname host login full-name info
   ;; Buffers
-  ;;
-  ;; This is an alist of the form (BUFFER . CHANNEL-DATA), where
-  ;; CHANNEL-DATA is either nil or an erc-channel-user struct.
   (buffers nil))
 
 (cl-defstruct (erc-channel-user (:type vector) :named)
diff --git a/test/lisp/erc/erc-tests.el b/test/lisp/erc/erc-tests.el
index 40a2d2de657..d6c63934163 100644
--- a/test/lisp/erc/erc-tests.el
+++ b/test/lisp/erc/erc-tests.el
@@ -147,7 +147,7 @@
       (should (looking-at-p (regexp-quote erc-prompt)))
       (setq erc-server-process (buffer-local-value 'erc-server-process
                                                    (get-buffer "ServNet"))
-            erc-default-recipients '("#chan")))
+            erc--target (erc--target-from-string "#chan")))
 
     (with-current-buffer (get-buffer-create "bob")
       (erc-tests--send-prep)
@@ -155,7 +155,7 @@
       (should (looking-at-p (regexp-quote erc-prompt)))
       (setq erc-server-process (buffer-local-value 'erc-server-process
                                                    (get-buffer "ServNet"))
-            erc-default-recipients '("bob")))
+            erc--target (erc--target-from-string "bob")))
 
     (ert-info ("Value: t (default)")
       (should (eq erc-hide-prompt t))