Save match data in markdown-check-change-for-wiki-link

  It's used in after-change-functions, which leads to weird bugs when the match
  data changes inside functions that didn't expect that
  (like dabbrev--safe-replace-match).
  Also, set inhibit-point-motion-hooks only once

Signed-off-by: Jason Blevins <jrblevin@sdf.org>

markdown-mode.el

@@ -1928,8 +1928,7 @@ Designed to be used with the `after-change-functions' hook.
 CHANGE is the number of bytes of pre-change text replaced by the
 given range."
   (interactive "nfrom: \nnto: \nnchange: ")
-  (let* ((inhibit-point-motion-hooks t)
-	 (inhibit-quit t)
+  (let* ((inhibit-quit t)
 	 (modified (buffer-modified-p))
 	 (buffer-undo-list t)
 	 (inhibit-read-only t)
@@ -1938,20 +1937,21 @@ given range."
 	 (current-point (point))
 	 deactivate-mark)
     (unwind-protect
-	(save-restriction
-	  ;; Extend the region to fontify so that it starts
-	  ;; and ends at safe places.
-	  (multiple-value-bind (new-from new-to)
-	      (markdown-extend-changed-region from to)
-	    ;; Unfontify existing fontification (start from scratch)
-	    (markdown-unfontify-region-wiki-links new-from new-to)
-	    ;; Now do the fontification.
-	    (markdown-fontify-region-wiki-links new-from new-to)))
-      (unless modified
-	(if (fboundp 'restore-buffer-modified-p)
-            (restore-buffer-modified-p nil)
-          (set-buffer-modified-p nil))))
-    (goto-char current-point)))
+        (save-match-data
+          (save-restriction
+            ;; Extend the region to fontify so that it starts
+            ;; and ends at safe places.
+            (multiple-value-bind (new-from new-to)
+                (markdown-extend-changed-region from to)
+              ;; Unfontify existing fontification (start from scratch)
+              (markdown-unfontify-region-wiki-links new-from new-to)
+              ;; Now do the fontification.
+              (markdown-fontify-region-wiki-links new-from new-to)))
+          (unless modified
+            (if (fboundp 'restore-buffer-modified-p)
+                (restore-buffer-modified-p nil)
+              (set-buffer-modified-p nil))))
+      (goto-char current-point))))
 
 (defun markdown-fontify-buffer-wiki-links ()
   "Refontify all wiki links in the buffer."