* lisp/electric.el (electric-indent-post-self-insert-function): Don't use

`pos' after modifying the buffer.

Fixes: debbugs:17449

1 files changed, 23 insertions, 22 deletions

diff --git a/lisp/electric.el b/lisp/electric.el
index e8ceaa6406c..bf73dbb256f 100644
--- a/lisp/electric.el
+++ b/lisp/electric.el
@@ -259,29 +259,30 @@ or comment."
                     (unless (eq act 'do-indent) (nth 8 (syntax-ppss))))))))
       ;; For newline, we want to reindent both lines and basically behave like
       ;; reindent-then-newline-and-indent (whose code we hence copied).
-      (when (<= pos (line-beginning-position))
-        (let ((before (copy-marker (1- pos) t)))
-          (save-excursion
-            (unless (or (memq indent-line-function
-                              electric-indent-functions-without-reindent)
-                        electric-indent-inhibit)
-              ;; Don't reindent the previous line if the indentation function
-              ;; is not a real one.
+      (let ((at-newline (<= pos (line-beginning-position))))
+        (when at-newline
+          (let ((before (copy-marker (1- pos) t)))
+            (save-excursion
+              (unless (or (memq indent-line-function
+                                electric-indent-functions-without-reindent)
+                          electric-indent-inhibit)
+                ;; Don't reindent the previous line if the indentation function
+                ;; is not a real one.
+                (goto-char before)
+                (indent-according-to-mode))
+              ;; We are at EOL before the call to indent-according-to-mode, and
+              ;; after it we usually are as well, but not always.  We tried to
+              ;; address it with `save-excursion' but that uses a normal marker
+              ;; whereas we need `move after insertion', so we do the
+              ;; save/restore by hand.
               (goto-char before)
-              (indent-according-to-mode))
-            ;; We are at EOL before the call to indent-according-to-mode, and
-            ;; after it we usually are as well, but not always.  We tried to
-            ;; address it with `save-excursion' but that uses a normal marker
-            ;; whereas we need `move after insertion', so we do the
-            ;; save/restore by hand.
-            (goto-char before)
-	    (when (eolp)
-	      ;; Remove the trailing whitespace after indentation because
-	      ;; indentation may (re)introduce the whitespace.
-	      (delete-horizontal-space t)))))
-      (unless (and electric-indent-inhibit
-                   (> pos (line-beginning-position)))
-        (indent-according-to-mode)))))
+              (when (eolp)
+                ;; Remove the trailing whitespace after indentation because
+                ;; indentation may (re)introduce the whitespace.
+                (delete-horizontal-space t)))))
+        (unless (and electric-indent-inhibit
+                     (not at-newline))
+          (indent-according-to-mode))))))
 
 (put 'electric-indent-post-self-insert-function 'priority  60)