master e35d68f: * lisp/dired.el (dired-readin): Don't bind inhibit-modification-hooks

[Stefan Monnier]

branch: master
commit e35d68f2d8958f345206979a1ed87d25b321cc10
Author: Stefan Monnier <address@hidden>
Commit: Stefan Monnier <address@hidden>

    * lisp/dired.el (dired-readin): Don't bind inhibit-modification-hooks
    
    Fixes bug#40332
---
 lisp/dired.el | 44 ++++++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/lisp/dired.el b/lisp/dired.el
index b66bb03..d58c37b 100644
--- a/lisp/dired.el
+++ b/lisp/dired.el
@@ -1208,15 +1208,11 @@ wildcards, erases the buffer, and builds the 
subdir-alist anew
 
   ;; default-directory and dired-actual-switches must be buffer-local
   ;; and initialized by now.
-  (let (dirname
-       ;; This makes read-in much faster.
-       ;; In particular, it prevents the font lock hook from running
-       ;; until the directory is all read in.
-       (inhibit-modification-hooks t))
-    (if (consp dired-directory)
-       (setq dirname (car dired-directory))
-      (setq dirname dired-directory))
-    (setq dirname (expand-file-name dirname))
+  (let ((dirname
+        (expand-file-name
+         (if (consp dired-directory)
+             (car dired-directory)
+           dired-directory))))
     (save-excursion
       ;; This hook which may want to modify dired-actual-switches
       ;; based on dired-directory, e.g. with ange-ftp to a SysV host
@@ -1226,17 +1222,25 @@ wildcards, erases the buffer, and builds the 
subdir-alist anew
          (setq buffer-undo-list nil))
       (setq-local file-name-coding-system
                   (or coding-system-for-read file-name-coding-system))
-      (let ((inhibit-read-only t)
-           ;; Don't make undo entries for readin.
-           (buffer-undo-list t))
-       (widen)
-       (erase-buffer)
-       (dired-readin-insert))
-      (goto-char (point-min))
-      ;; Must first make alist buffer local and set it to nil because
-      ;; dired-build-subdir-alist will call dired-clear-alist first
-      (setq-local dired-subdir-alist nil)
-      (dired-build-subdir-alist)
+      (widen)
+      ;; We used to bind `inhibit-modification-hooks' to try and speed up
+      ;; execution, in particular, to prevent the font-lock hook from running
+      ;; until the directory is all read in.
+      ;; I strongly suspect that this was only useful in Emacs<21, because
+      ;; jit-lock made it a non-issue.
+      ;; Nevertheless, I used `combine-change-calls' which provides the
+      ;; same performance advantages, just in case.
+      (combine-change-calls (point-min) (point-max)
+       (let ((inhibit-read-only t)
+             ;; Don't make undo entries for readin.
+             (buffer-undo-list t))
+         (erase-buffer)
+         (dired-readin-insert))
+       (goto-char (point-min))
+       ;; Must first make alist buffer local and set it to nil because
+       ;; dired-build-subdir-alist will call dired-clear-alist first
+       (setq-local dired-subdir-alist nil)
+       (dired-build-subdir-alist))
       (let ((attributes (file-attributes dirname)))
        (if (eq (car attributes) t)
            (set-visited-file-modtime (file-attribute-modification-time