Allow fine-grained image-cache flushing.

* dispextern.h (struct image): Add `dependencies' field.
(clear_image_caches): Change arg to Lisp_Object.
* image.c (make_image): Initialize `dependencies' field.
(clear_image_cache): Change arg to allow fine-grained flushing.
Perform the flush even if image-cache-eviction-delay is nil.
(clear_image_caches): Change arg to Lisp_Object.
(Fclear_image_cache): Expand meaning of the argument.
(mark_image): Mark `dependencies' field.
* xfaces.c (clear_face_cache): Adapt arg to call to clear_image_caches.
(lface_hash): Use XHASH rather than XFASTINT.
(face_at_buffer_position): Fix int -> EMACS_INT position.
* xdisp.c (next_overlay_change): Fix int -> EMACS_INT position.
(select_frame_for_redisplay): Remove code duplication.
(redisplay_internal): Adapt arg to call to clear_image_caches.

1 files changed, 2 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index cbb32b3710d..686f48fcb95 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -596,6 +596,8 @@ functions and variables (formerly used for Tamil script).
 
 * Lisp Changes in Emacs 23.1
 
+** `clear-image-cache' can be told to flush only images of a specific file.
+
 ** clone-indirect-buffer now runs the clone-indirect-buffer-hook.
 
 ** `beginning-of-defun-function' now takes one argument, the count