* window.h (struct window): Replace last_cursor with last_cursor_vpos

because this is the only last cursor data we need to keep and consult.
* window.c (replace_window, set_window_buffer, Fsplit_window_internal):
* xdisp.c (mark_window_display_accurate_1, try_cursor_movement):
Adjust users.

src/ChangeLog

+2013-08-26  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* window.h (struct window): Replace last_cursor with last_cursor_vpos
+	because this is the only last cursor data we need to keep and consult.
+	* window.c (replace_window, set_window_buffer, Fsplit_window_internal):
+	* xdisp.c (mark_window_display_accurate_1, try_cursor_movement):
+	Adjust users.
+
 2013-08-26  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	Fix recovering from possible decompression error.  Since

src/window.c

@@ -2027,8 +2027,8 @@ replace_window (Lisp_Object old, Lisp_Object new, int setflag)
       n->desired_matrix = n->current_matrix = 0;
       n->vscroll = 0;
       memset (&n->cursor, 0, sizeof (n->cursor));
-      memset (&n->last_cursor, 0, sizeof (n->last_cursor));
       memset (&n->phys_cursor, 0, sizeof (n->phys_cursor));
+      n->last_cursor_vpos = 0;
       n->phys_cursor_type = -1;
       n->phys_cursor_width = -1;
       n->must_be_updated_p = 0;
@@ -3172,7 +3172,7 @@ set_window_buffer (Lisp_Object window, Lisp_Object buffer,
 
   w->window_end_pos = 0;
   w->window_end_vpos = 0;
-  memset (&w->last_cursor, 0, sizeof w->last_cursor);
+  w->last_cursor_vpos = 0;
 
   if (!(keep_margins_p && samebuf))
     { /* If we're not actually changing the buffer, don't reset hscroll and
@@ -3911,7 +3911,7 @@ set correctly.  See the code of `split-window' for how this is done.  */)
     }
 
   n->window_end_valid = 0;
-  memset (&n->last_cursor, 0, sizeof n->last_cursor);
+  n->last_cursor_vpos = 0;
 
   /* Get special geometry settings from reference window.  */
   n->left_margin_cols = r->left_margin_cols;

src/window.h

@@ -229,10 +229,6 @@ struct window
        as the normal  may yield a matrix which is too small.  */
     int nrows_scale_factor, ncols_scale_factor;
 
-    /* Cursor position as of last update that completed without
-       pause.  This is the position of last_point.  */
-    struct cursor_pos last_cursor;
-
     /* Intended cursor position.   This is a position within the
        glyph matrix.  */
     struct cursor_pos cursor;
@@ -240,6 +236,10 @@ struct window
     /* Where the cursor actually is.  */
     struct cursor_pos phys_cursor;
 
+    /* Vertical cursor position as of last update that completed
+       without pause.  This is the position of last_point.  */
+    int last_cursor_vpos;
+
     /* Cursor type and width of last cursor drawn on the window.
        Used for X and w32 frames; -1 initially.  */
     int phys_cursor_type, phys_cursor_width;

src/xdisp.c

@@ -13743,7 +13743,7 @@ mark_window_display_accurate_1 (struct window *w, int accurate_p)
       w->current_matrix->begv = BUF_BEGV (b);
       w->current_matrix->zv = BUF_ZV (b);
 
-      w->last_cursor = w->cursor;
+      w->last_cursor_vpos = w->cursor.vpos;
       w->last_cursor_off_p = w->cursor_off_p;
 
       if (w == XWINDOW (selected_window))
@@ -15087,12 +15087,12 @@ try_cursor_movement (Lisp_Object window, struct text_pos startp, int *scroll_ste
 
       /* Start with the row the cursor was displayed during the last
 	 not paused redisplay.  Give up if that row is not valid.  */
-      if (w->last_cursor.vpos < 0
-	  || w->last_cursor.vpos >= w->current_matrix->nrows)
+      if (w->last_cursor_vpos < 0
+	  || w->last_cursor_vpos >= w->current_matrix->nrows)
 	rc = CURSOR_MOVEMENT_MUST_SCROLL;
       else
 	{
-	  row = MATRIX_ROW (w->current_matrix, w->last_cursor.vpos);
+	  row = MATRIX_ROW (w->current_matrix, w->last_cursor_vpos);
 	  if (row->mode_line_p)
 	    ++row;
 	  if (!row->enabled_p)