(insert-image-file): Add yank-handler.

(image-file-yank-handler): Yank handler to make unique copies of
images when they are yanked into a buffer next to each other.

1 files changed, 14 insertions, 0 deletions

diff --git a/lisp/image-file.el b/lisp/image-file.el
index 8f74dd63c0a..be95470184c 100644
--- a/lisp/image-file.el
+++ b/lisp/image-file.el
@@ -118,6 +118,7 @@ the command `insert-file-contents'."
               (create-image data nil t))
              (props
               `(display ,image
+                        yank-handler (image-file-yank-handler)
                         intangible ,image
                         rear-nonsticky (display intangible)
                         ;; This a cheap attempt to make the whole buffer
@@ -135,6 +136,19 @@ the command `insert-file-contents'."
           (setq truncate-lines t))))
     rval))
 
+;; We use a yank-handler to make yanked images unique, so that
+;; yanking two copies of the same image next to each other are
+;; recognized as two different images.
+(defun image-file-yank-handler (string)
+  "Yank handler for inserting an image into a buffer."
+  (let ((image (get-text-property 0 'display string)))
+    (if (consp image)
+        (put-text-property 0 (length string)
+                           'display
+                           (cons (car image) (cdr image))
+                           string))
+    (insert string)))
+
 (put 'image-file-handler 'safe-magic t)
 (defun image-file-handler (operation &rest args)
   "Filename handler for inserting image files.