* frame.c (make_frame): Do not set window's buffer to t.

* window.c (Fsplit_window_internal): Likewise.  Previously it was
used to indicate that the window is being set up.  Now we use
set_window_buffer for all new windows, so the condition in ...
(Fset_window_buffer): ... is always true and can be removed.

src/ChangeLog

+2012-12-07  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* frame.c (make_frame): Do not set window's buffer to t.
+	* window.c (Fsplit_window_internal): Likewise.  Previously it was
+	used to indicate that the window is being set up.  Now we use
+	set_window_buffer for all new windows, so the condition in ...
+	(Fset_window_buffer): ... is always true and can be removed.
+
 2012-12-07  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	Convenient macro to check whether the buffer is hidden.

src/frame.c

@@ -348,7 +348,6 @@ make_frame (int mini_p)
   {
     Lisp_Object buf = Fcurrent_buffer ();
 
-    wset_buffer (XWINDOW (root_window), Qt);
     /* If current buffer is hidden, try to find another one.  */
     if (BUFFER_HIDDEN_P (XBUFFER (buf)))
       buf = other_buffer_safely (buf);
@@ -364,14 +363,11 @@ make_frame (int mini_p)
   }
 
   if (mini_p)
-    {
-      wset_buffer (XWINDOW (mini_window), Qt);
     set_window_buffer (mini_window,
 		       (NILP (Vminibuffer_list)
 			? get_minibuffer (0)
 			: Fcar (Vminibuffer_list)),
 		       0, 0);
-    }
 
   fset_root_window (f, root_window);
   fset_selected_window (f, root_window);

src/window.c

@@ -3250,8 +3250,7 @@ This function runs `window-scroll-functions' before running
   tem = w->buffer;
   if (NILP (tem))
     error ("Window is deleted");
-  else if (!EQ (tem, Qt))
-    /* w->buffer is t when the window is first being set up.  */
+  else
     {
       if (!EQ (tem, buffer))
 	{
@@ -3914,7 +3913,6 @@ set correctly.  See the code of `split-window' for how this is done.  */)
       wset_next (o, new);
     }
 
-  wset_buffer (n, Qt);
   wset_window_end_valid (n, Qnil);
   memset (&n->last_cursor, 0, sizeof n->last_cursor);