Make delete_all_subwindows argument a Lisp_Object.

* window.c (delete_window, Fset_window_configuration): Call
delete_all_subwindows with window as argument.
(delete_all_subwindows): Take a window as argument and not a
structure.  Rewrite.

* window.h: delete_all_subwindows now takes a Lisp_Object as
argument.

* frame.c (delete_frame): Call delete_all_subwindows with root
window as argument.

4 files changed, 40 insertions, 25 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 5e51d8c6a76..c7bcdec0512 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -6,13 +6,21 @@
 	(window_box_text_cols): Replace with window_body_cols.
 	(Fwindow_width, Fscroll_left, Fscroll_right): Use
 	window_body_cols instead of window_box_text_cols.
+	(delete_window, Fset_window_configuration): Call
+	delete_all_subwindows with window as argument.
+	(delete_all_subwindows): Take a window as argument and not a
+	structure.  Rewrite.
 
 	* window.h: Extern window_body_cols instead of
-	window_box_text_cols.
+	window_box_text_cols.  delete_all_subwindows now takes a
+	Lisp_Object as argument.
 
 	* indent.c (compute_motion, Fcompute_motion): Use
 	window_body_cols instead of window_box_text_cols.
 
+	* frame.c (delete_frame): Call delete_all_subwindows with root
+	window as argument.
+
 2011-06-07  Daniel Colascione  <dan.colascione@gmail.com>
 
 	* fns.c (Fputhash): Document return value.
diff --git a/src/frame.c b/src/frame.c
index 68984a68d52..71881265b44 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -1336,7 +1336,7 @@ delete_frame (Lisp_Object frame, Lisp_Object force)
 
   /* Mark all the windows that used to be on FRAME as deleted, and then
      remove the reference to them.  */
-  delete_all_subwindows (XWINDOW (f->root_window));
+  delete_all_subwindows (f->root_window);
   f->root_window = Qnil;
 
   Vframe_list = Fdelq (frame, Vframe_list);
diff --git a/src/window.c b/src/window.c
index 43635fe5a6b..ee62f57ee07 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2001,9 +2001,9 @@ delete_window (register Lisp_Object window)
   /* Since we may be deleting combination windows, we must make sure that
      not only p but all its children have been marked as deleted.  */
   if (! NILP (p->hchild))
-    delete_all_subwindows (XWINDOW (p->hchild));
+    delete_all_subwindows (p->hchild);
   else if (! NILP (p->vchild))
-    delete_all_subwindows (XWINDOW (p->vchild));
+    delete_all_subwindows (p->vchild);
 
   /* Mark this window as deleted.  */
   p->buffer = p->hchild = p->vchild = Qnil;
@@ -6260,7 +6260,7 @@ the return value is nil.  Otherwise the value is t.  */)
 	 Save their current buffers in their height fields, since we may
 	 need it later, if a buffer saved in the configuration is now
 	 dead.  */
-      delete_all_subwindows (XWINDOW (FRAME_ROOT_WINDOW (f)));
+      delete_all_subwindows (FRAME_ROOT_WINDOW (f));
 
       for (k = 0; k < saved_windows->header.size; k++)
 	{
@@ -6448,31 +6448,38 @@ the return value is nil.  Otherwise the value is t.  */)
   return (FRAME_LIVE_P (f) ? Qt : Qnil);
 }
 
-/* Mark all windows now on frame as deleted
-   by setting their buffers to nil.  */
-
+/* Delete all subwindows reachable via the next, vchild, and hchild
+   slots of WINDOW.  */
 void
-delete_all_subwindows (register struct window *w)
+delete_all_subwindows (Lisp_Object window)
 {
+  register struct window *w;
+
+  w = XWINDOW (window);
+
   if (!NILP (w->next))
-    delete_all_subwindows (XWINDOW (w->next));
-  if (!NILP (w->vchild))
-    delete_all_subwindows (XWINDOW (w->vchild));
-  if (!NILP (w->hchild))
-    delete_all_subwindows (XWINDOW (w->hchild));
+    /* Delete WINDOW's siblings (we traverse postorderly).  */
+    delete_all_subwindows (w->next);
 
   w->total_lines = w->buffer;       /* See Fset_window_configuration for excuse.  */
 
-  if (!NILP (w->buffer))
-    unshow_buffer (w);
-
-  /* We set all three of these fields to nil, to make sure that we can
-     distinguish this dead window from any live window.  Live leaf
-     windows will have buffer set, and combination windows will have
-     vchild or hchild set.  */
-  w->buffer = Qnil;
-  w->vchild = Qnil;
-  w->hchild = Qnil;
+  if (!NILP (w->vchild))
+    {
+      delete_all_subwindows (w->vchild);
+      w->vchild = Qnil;
+    }
+  else if (!NILP (w->hchild))
+    {
+      delete_all_subwindows (w->hchild);
+      w->hchild = Qnil;
+    }
+  else if (!NILP (w->buffer))
+    {
+      unshow_buffer (w);
+      unchain_marker (XMARKER (w->pointm));
+      unchain_marker (XMARKER (w->start));
+      w->buffer = Qnil;
+    }
 
   Vwindow_list = Qnil;
 }
diff --git a/src/window.h b/src/window.h
index 7f937e92284..37d22bd7a76 100644
--- a/src/window.h
+++ b/src/window.h
@@ -770,7 +770,7 @@ EXFUN (Fwindow_dedicated_p, 1);
 extern void set_window_height (Lisp_Object, int, int);
 extern void set_window_width (Lisp_Object, int, int);
 extern void change_window_heights (Lisp_Object, int);
-extern void delete_all_subwindows (struct window *);
+extern void delete_all_subwindows (Lisp_Object);
 extern void freeze_window_starts (struct frame *, int);
 extern void grow_mini_window (struct window *, int);
 extern void shrink_mini_window (struct window *);