Import buffer-display-count, buffer-display-time; thank you, Jeff Sparkes. man/ChangeLog addition: 2010-05-17 Jeff Sparkes <jsparkes@gmail.com> * lispref/windows.texi (Buffers and Windows): Document buffer-display-count and buffer-display-time with descriptions from GNU emacs lispref. * lispref/locals.texi (Standard Buffer-Local Variables): Add buffer-display-count and buffer-display-time. src/ChangeLog addition: 2010-05-17 Jeff Sparkes <jsparkes@gmail.com> * buffer.c (complex_vars_of_buffer): Add buffer local variables buffer-display-count and buffer-display-time. (common_init_complex_vars_of_buffer): Initialize them here. * bufslots.h: Add slots for buffer-display-count and buffer-display-time. * window.c (Fset_window_buffer): Update buffer-display-count and buffer-display-time whenever a buffer is displayed.

--- a/src/bufslots.h	Mon May 24 10:43:29 2010 +0200
+++ b/src/bufslots.h	Fri May 28 13:48:22 2010 +0100
@@ -216,6 +216,12 @@
     /* The string generated by formatting the modeline in this buffer. */
     MARKED_SLOT (generated_modeline_string)
 
+    /* Incremented each time a buffer is displayed using set-window-buffer. */
+    MARKED_SLOT (display_count)
+
+    /* Last time this buffer was displayed using set-window-buffer. */
+    MARKED_SLOT (display_time)
+
     /* A hash table that maps from a "generic extent" (an extent in
        `modeline-format') into a buffer-specific extent. */
     MARKED_SLOT (modeline_extent_table)