master b299c04201: Fix computation of outline heading level for non-git diff

[Juri Linkov]

branch: master
commit b299c042012c769280ede736907777e80b624ff0
Author: Matthias Meulien <orontee@gmail.com>
Commit: Juri Linkov <juri@linkov.net>

    Fix computation of outline heading level for non-git diff
    
    * lisp/vc/diff-mode.el (diff-setup-buffer-type): Compute outline heading 
level
    using diff-hunk-header-re (bug#51809).
    (diff--font-lock-prettify): Disable prettify in non-git diff.
---
 lisp/vc/diff-mode.el | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lisp/vc/diff-mode.el b/lisp/vc/diff-mode.el
index 0bf7899246..d0c05d3204 100644
--- a/lisp/vc/diff-mode.el
+++ b/lisp/vc/diff-mode.el
@@ -1596,8 +1596,8 @@ modified lines of the diff."
                   nil)))
   (when (eq diff-buffer-type 'git)
     (setq diff-outline-regexp
-          (concat "\\(^diff --git.*\n\\|" diff-hunk-header-re "\\)"))
-    (setq-local outline-level #'diff--outline-level))
+          (concat "\\(^diff --git.*\n\\|" diff-hunk-header-re "\\)")))
+  (setq-local outline-level #'diff--outline-level)
   (setq-local outline-regexp diff-outline-regexp))
 
 (defun diff-delete-if-empty ()
@@ -2599,7 +2599,8 @@ fixed, visit it in a buffer."
   nil nil 'center)
 
 (defun diff--font-lock-prettify (limit)
-  (when diff-font-lock-prettify
+  (when (and diff-font-lock-prettify
+             (eq diff-buffer-type 'git))
     (save-excursion
       ;; FIXME: Include the first space for context-style hunks!
       (while (re-search-forward "^[-+! ]" limit t)