ERC's which-func modeline thing is read-only, very bad

Will fix later I guess

config-look-and-feel.org

@@ -57,7 +57,8 @@
     (advice-add #'doom-modeline-project-p
                 :around
                 #'my/dont-check-project-samba)
-    )
+
+    (require 'erc-doom-modeline-hack))
 
   ;; Modeline display useful information
   (setq global-mode-string '(" "))

lisp/erc-doom-modeline-hack.el

@@ -0,0 +1,55 @@
+;;; erc-doom-modeline-hack.el ---  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2025 Benson Chu
+
+;; Author: Benson Chu <bensonchu457@gmail.com>
+;; Created: [2025-09-01 10:50]
+
+;; This file is not part of GNU Emacs
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(defun my/string-pixel-width (string)
+  "Return the width of STRING in pixels.
+
+If you call this function to measure pixel width of a string
+with embedded newlines, it returns the width of the widest
+substring that does not include newlines."
+  (declare (important-return-value t))
+  (if (zerop (length string))
+      0
+    ;; Keeping a work buffer around is more efficient than creating a
+    ;; new temporary buffer.
+    (let ((inhibit-read-only t))
+      (with-current-buffer (get-buffer-create " *string-pixel-width*")
+        ;; If `display-line-numbers' is enabled in internal buffers
+        ;; (e.g. globally), it breaks width calculation (bug#59311)
+        (setq-local display-line-numbers nil)
+        (delete-region (point-min) (point-max))
+        ;; Disable line-prefix and wrap-prefix, for the same reason.
+        (setq line-prefix nil
+	          wrap-prefix nil)
+        (insert (propertize string 'line-prefix nil 'wrap-prefix nil))
+        (car (buffer-text-pixel-size nil nil t))))))
+
+(advice-add #'string-pixel-width
+            :override
+            #'my/string-pixel-width)
+
+(provide 'erc-doom-modeline-hack)
+;;; erc-doom-modeline-hack.el ends here