[elpa] externals/org aa789b89d7: Do not mark buffer as modified with org-preserve-local-variables

[ELPA Syncer]

branch: externals/org
commit aa789b89d7bfa1220ec72e0d9fd996584bdd69f4
Author: Ignacio Casso <ignaciocasso@hotmail.com>
Commit: Ihor Radchenko <yantar92@gmail.com>

    Do not mark buffer as modified with org-preserve-local-variables
    
    * lisp/org-macs.el (org-preserve-local-variables): Do not mark buffer
    as modified or alter `buffer-undo-list' when body does not actually
    modify the buffer.
    
    This commit fixes a bug with `org-copy-subtree', which marked the
    buffer as modified and added an entry to the undo list when the visited
    file had local variables.
---
 lisp/org-macs.el | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lisp/org-macs.el b/lisp/org-macs.el
index 19e5f42e92..c34ff3ab7a 100644
--- a/lisp/org-macs.el
+++ b/lisp/org-macs.el
@@ -166,13 +166,19 @@
             (and (re-search-backward "^[ \t]*# +Local Variables:"
                                      (max (- (point) 3000) 1)
                                      t)
-                 (delete-and-extract-region (point) (point-max)))))))
+               (let ((buffer-undo-list t))
+                (delete-and-extract-region (point) (point-max)))))))
+         (tick-counter-before (buffer-modified-tick)))
      (unwind-protect (progn ,@body)
        (when local-variables
         (org-with-wide-buffer
          (goto-char (point-max))
          (unless (bolp) (insert "\n"))
-         (insert local-variables))))))
+          (let ((modified (< tick-counter-before (buffer-modified-tick)))
+                (buffer-undo-list t))
+           (insert local-variables)
+            (unless modified
+              (restore-buffer-modified-p nil))))))))
 
 (defmacro org-no-popups (&rest body)
   "Suppress popup windows and evaluate BODY."