Resurrect image loading under auto-image-file-mode

* src/image.c (x_find_image_fd): Handle the case of -2 returned by
'openp' specially.  This special case was lost in the changes on
2015-08-18.  (Bug#21685)

1 files changed, 13 insertions, 1 deletions

diff --git a/src/image.c b/src/image.c
index c702782b64b..9970e5881e0 100644
--- a/src/image.c
+++ b/src/image.c
@@ -2292,7 +2292,19 @@ x_find_image_fd (Lisp_Object file, int *pfd)
   /* Try to find FILE in data-directory/images, then x-bitmap-file-path.  */
   fd = openp (search_path, file, Qnil, &file_found,
               pfd ? Qt : make_number (R_OK), false);
-  if (fd < 0)
+  if (fd >= 0 || fd == -2)
+    {
+      file_found = ENCODE_FILE (file_found);
+      if (fd == -2)
+        {
+          /* The file exists locally, but has a file handler.  (This
+             happens, e.g., under Auto Image File Mode.)  'openp'
+             didn't open the file, so we should, because the caller
+             expects that.  */
+          fd = emacs_open (SSDATA (file_found), O_RDONLY | O_BINARY, 0);
+        }
+    }
+  else  /* fd < 0, but not -2 */
     return Qnil;
   if (pfd)
     *pfd = fd;