Remove clone-number support. Provide clone-of parameter in window states.

* window.h (window): Remove clone_number slot.
* window.c (Fwindow_clone_number, Fset_window_clone_number):
Remove.
(make_parent_window, make_window, saved_window)
(Fset_window_configuration, save_window_save): Don't deal with
clone numbers.
* buffer.c (Qclone_number): Remove declaration.
(sort_overlays, overlay_strings): Don't deal with clone numbers.

* window.el (window-state-get-1): Don't assign clone numbers.
Add clone-of item to list of window parameters.
(window-state-put-2): Don't process clone numbers.
(display-buffer-alist): Fix doc-string.

4 files changed, 18 insertions, 49 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index bb5c579d7fa..fff817118ea 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,14 @@
+2011-07-02  Martin Rudalics  <rudalics@gmx.at>
+
+        * window.h (window): Remove clone_number slot.
+        * window.c (Fwindow_clone_number, Fset_window_clone_number):
+        Remove.
+        (make_parent_window, make_window, saved_window)
+        (Fset_window_configuration, save_window_save): Don't deal with
+        clone numbers.
+        * buffer.c (Qclone_number): Remove declaration.
+        (sort_overlays, overlay_strings): Don't deal with clone numbers.
+
 2011-07-02  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         Add multiple inheritance to keymaps.
diff --git a/src/buffer.c b/src/buffer.c
index 328963be78c..006153b0424 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -146,7 +146,7 @@ static Lisp_Object Qoverlayp;
 
 Lisp_Object Qpriority, Qbefore_string, Qafter_string;
 
-static Lisp_Object Qclone_number, Qevaporate;
+static Lisp_Object Qevaporate;
 
 Lisp_Object Qmodification_hooks;
 Lisp_Object Qinsert_in_front_hooks;
@@ -2900,13 +2900,10 @@ sort_overlays (Lisp_Object *overlay_vec, ptrdiff_t noverlays, struct window *w)
              overlays that are limited to some other window.  */
           if (w)
             {
-              Lisp_Object window, clone_number;
+              Lisp_Object window;
 
               window = Foverlay_get (overlay, Qwindow);
-              clone_number = Foverlay_get (overlay, Qclone_number);
-              if (WINDOWP (window) && XWINDOW (window) != w
-                  && (! NUMBERP (clone_number)
-                      || XFASTINT (clone_number) != XFASTINT (w->clone_number)))
+              if (WINDOWP (window) && XWINDOW (window) != w)
                 continue;
             }
 
@@ -3035,7 +3032,7 @@ record_overlay_string (struct sortstrlist *ssl, Lisp_Object str,
 EMACS_INT
 overlay_strings (EMACS_INT pos, struct window *w, unsigned char **pstr)
 {
-  Lisp_Object overlay, window, clone_number, str;
+  Lisp_Object overlay, window, str;
   struct Lisp_Overlay *ov;
   EMACS_INT startpos, endpos;
   int multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
@@ -3054,12 +3051,8 @@ overlay_strings (EMACS_INT pos, struct window *w, unsigned char **pstr)
       if (endpos != pos && startpos != pos)
         continue;
       window = Foverlay_get (overlay, Qwindow);
-      clone_number = Foverlay_get (overlay, Qclone_number);
-      if (WINDOWP (window) && XWINDOW (window) != w
-          && (! NUMBERP (clone_number)
-              || XFASTINT (clone_number) != XFASTINT (w->clone_number)))
+      if (WINDOWP (window) && XWINDOW (window) != w)
         continue;
-
       if (startpos == pos
           && (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str)))
         record_overlay_string (&overlay_heads, str,
@@ -3086,10 +3079,7 @@ overlay_strings (EMACS_INT pos, struct window *w, unsigned char **pstr)
       if (endpos != pos && startpos != pos)
         continue;
       window = Foverlay_get (overlay, Qwindow);
-      clone_number = Foverlay_get (overlay, Qclone_number);
-      if (WINDOWP (window) && XWINDOW (window) != w
-          && (! NUMBERP (clone_number)
-              || XFASTINT (clone_number) != XFASTINT (w->clone_number)))
+      if (WINDOWP (window) && XWINDOW (window) != w)
         continue;
       if (startpos == pos
           && (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str)))
@@ -5229,7 +5219,6 @@ syms_of_buffer (void)
   DEFSYM (Qinsert_behind_hooks, "insert-behind-hooks");
   DEFSYM (Qget_file_buffer, "get-file-buffer");
   DEFSYM (Qpriority, "priority");
-  DEFSYM (Qclone_number, "clone-number");
   DEFSYM (Qbefore_string, "before-string");
   DEFSYM (Qafter_string, "after-string");
   DEFSYM (Qfirst_change_hook, "first-change-hook");
diff --git a/src/window.c b/src/window.c
index dfd43ba07bf..154efe4a222 100644
--- a/src/window.c
+++ b/src/window.c
@@ -408,14 +408,6 @@ buffer of the selected window before each command.  */)
   return select_window (window, norecord, 0);
 }
 
-DEFUN ("window-clone-number", Fwindow_clone_number, Swindow_clone_number, 0, 1, 0,
-       doc: /* Return WINDOW's clone number.
-WINDOW can be any window and defaults to the selected one.  */)
-     (Lisp_Object window)
-{
-  return decode_any_window (window)->clone_number;
-}
-
 DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
        doc: /* Return the buffer that WINDOW is displaying.
 WINDOW can be any window and defaults to the selected one.
@@ -3087,18 +3079,6 @@ set_window_buffer (Lisp_Object window, Lisp_Object buffer, int run_hooks_p, int
   unbind_to (count, Qnil);
 }
 
-DEFUN ("set-window-clone-number", Fset_window_clone_number, Sset_window_clone_number, 2, 2, 0,
-       doc: /* Set WINDOW's clone number to CLONE-NUMBER.
-WINDOW can be any window and defaults to the selected one.  */)
-     (Lisp_Object window, Lisp_Object clone_number)
-{
-  register struct window *w = decode_any_window (window);
-
-  CHECK_NUMBER (clone_number);
-  w->clone_number = clone_number;
-  return w->clone_number;
-}
-
 DEFUN ("set-window-buffer", Fset_window_buffer, Sset_window_buffer, 2, 3, 0,
        doc: /* Make WINDOW display BUFFER-OR-NAME as its contents.
 WINDOW has to be a live window and defaults to the selected one.
@@ -3289,7 +3269,6 @@ make_parent_window (Lisp_Object window, int horflag)
 
   ++sequence_number;
   XSETFASTINT (p->sequence_number, sequence_number);
-  XSETFASTINT (p->clone_number, sequence_number);
 
   replace_window (window, parent, 1);
 
@@ -3335,7 +3314,6 @@ make_window (void)
   XSETFASTINT (w->use_time, 0);
   ++sequence_number;
   XSETFASTINT (w->sequence_number, sequence_number);
-  XSETFASTINT (w->clone_number, sequence_number);
   w->temslot = w->last_modified = w->last_overlay_modified = Qnil;
   XSETFASTINT (w->last_point, 0);
   w->last_had_star = w->vertical_scroll_bar = Qnil;
@@ -5348,8 +5326,7 @@ struct saved_window
 {
   struct vectorlike_header header;
 
-  Lisp_Object window, clone_number;
-  Lisp_Object buffer, start, pointm, mark;
+  Lisp_Object window, buffer, start, pointm, mark;
   Lisp_Object left_col, top_line, total_cols, total_lines;
   Lisp_Object normal_cols, normal_lines;
   Lisp_Object hscroll, min_hscroll;
@@ -5568,7 +5545,6 @@ the return value is nil.  Otherwise the value is t.  */)
                 }
             }
 
-          w->clone_number = p->clone_number;
           /* If we squirreled away the buffer in the window's height,
              restore it now.  */
           if (BUFFERP (w->total_lines))
@@ -5851,7 +5827,6 @@ save_window_save (Lisp_Object window, struct Lisp_Vector *vector, int i)
 
       XSETFASTINT (w->temslot, i); i++;
       p->window = window;
-      p->clone_number = w->clone_number;
       p->buffer = w->buffer;
       p->left_col = w->left_col;
       p->top_line = w->top_line;
@@ -6596,7 +6571,6 @@ function `window-nest' and altered by the function `set-window-nest'.  */);
   defsubr (&Sset_frame_selected_window);
   defsubr (&Spos_visible_in_window_p);
   defsubr (&Swindow_line_height);
-  defsubr (&Swindow_clone_number);
   defsubr (&Swindow_buffer);
   defsubr (&Swindow_parent);
   defsubr (&Swindow_top_child);
@@ -6646,7 +6620,6 @@ function `window-nest' and altered by the function `set-window-nest'.  */);
   defsubr (&Sdelete_window_internal);
   defsubr (&Sresize_mini_window_internal);
   defsubr (&Sset_window_buffer);
-  defsubr (&Sset_window_clone_number);
   defsubr (&Srun_window_configuration_change_hook);
   defsubr (&Sselect_window);
   defsubr (&Sforce_window_update);
diff --git a/src/window.h b/src/window.h
index c3f59e4b116..485734e907e 100644
--- a/src/window.h
+++ b/src/window.h
@@ -165,10 +165,6 @@ struct window
     /* Unique number of window assigned when it was created.  */
     Lisp_Object sequence_number;
 
-    /* Sequence number of window this window was cloned from.  Identic
-       to sequence number if window was not cloned.  */
-    Lisp_Object clone_number;
-
     /* No permanent meaning; used by save-window-excursion's
        bookkeeping.  */
     Lisp_Object temslot;