(move_it_by_lines): Don't do optimizations if NEED_Y_P

is zero.  It's not worth the complexity.
(invisible_text_between_p): Put in #if 0 because unused.

diff --git a/src/xdisp.c b/src/xdisp.c
index 6127fe4e00a20fc3738f6fabc1fe579d8a17df26..ae35c982e977b3163bd6f3f3626cfebcdf88c346 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -5071,6 +5071,8 @@ move_it_vertically (it, dy)
 }
 
 
+#if 0 /* Currently not used.  */
+
 /* Return non-zero if some text between buffer positions START_CHARPOS
    and END_CHARPOS is invisible.  IT->window is the window for text
    property lookup.  */
@@ -5101,6 +5103,8 @@ invisible_text_between_p (it, start_charpos, end_charpos)
   return invisible_found_p;
 }
 
+#endif /* 0 */
+
 
 /* Move IT by a specified number DVPOS of screen lines down.  DVPOS
    negative means move up.  DVPOS == 0 means move to the start of the
@@ -5136,80 +5140,12 @@ move_it_by_lines (it, dvpos, need_y_p)
       xassert (it->current_x == 0 && it->hpos == 0);
     }
   else if (dvpos > 0)
-    {
-      /* If there are no continuation lines, and if there is no
-        selective display, try the simple method of moving forward
-        DVPOS newlines, then see where we are.  */
-      if (!need_y_p && it->truncate_lines_p && it->selective == 0)
-       {
-         int shortage = 0, charpos;
-
-         if (FETCH_BYTE (IT_BYTEPOS (*it)) == '\n')
-           charpos = IT_CHARPOS (*it) + 1;
-         else
-           charpos = scan_buffer ('\n', IT_CHARPOS (*it), 0, dvpos,
-                                  &shortage, 0);
-         
-         if (!invisible_text_between_p (it, IT_CHARPOS (*it), charpos))
-           {
-             struct text_pos pos;
-             CHARPOS (pos) = charpos;
-             BYTEPOS (pos) = CHAR_TO_BYTE (charpos);
-             reseat (it, pos, 1);
-             it->vpos += dvpos - shortage;
-             it->hpos = it->current_x = 0;
-             return;
-           }
-       }
-
-      move_it_to (it, -1, -1, -1, it->vpos + dvpos, MOVE_TO_VPOS);
-    }
+    move_it_to (it, -1, -1, -1, it->vpos + dvpos, MOVE_TO_VPOS);
   else
     {
       struct it it2;
       int start_charpos, i;
-
-      /* If there are no continuation lines, and if there is no
-        selective display, try the simple method of moving backward
-        -DVPOS newlines.  */
-      if (!need_y_p && it->truncate_lines_p && it->selective == 0)
-       {
-         int shortage;
-         int charpos = IT_CHARPOS (*it);
-         int bytepos = IT_BYTEPOS (*it);
-
-         /* If in the middle of a line, go to its start.  */
-         if (charpos > BEGV && FETCH_BYTE (bytepos - 1) != '\n')
-           {
-             charpos = find_next_newline_no_quit (charpos, -1);
-             bytepos = CHAR_TO_BYTE (charpos);
-           }
-
-         if (charpos == BEGV)
-           {
-             struct text_pos pos;
-             CHARPOS (pos) = charpos;
-             BYTEPOS (pos) = bytepos;
-             reseat (it, pos, 1);
-             it->hpos = it->current_x = 0;
-             return;
-           }
-         else
-           {
-             charpos = scan_buffer ('\n', charpos - 1, 0, dvpos, &shortage, 0);
-             if (!invisible_text_between_p (it, charpos, IT_CHARPOS (*it)))
-               {
-                 struct text_pos pos;
-                 CHARPOS (pos) = charpos;
-                 BYTEPOS (pos) = CHAR_TO_BYTE (charpos);
-                 reseat (it, pos, 1);
-                 it->vpos += dvpos + (shortage ? shortage - 1 : 0);
-                 it->hpos = it->current_x = 0;
-                 return;
-               }
-           }
-       }
-
+      
       /* Go back -DVPOS visible lines and reseat the iterator there.  */
       start_charpos = IT_CHARPOS (*it);
       for (i = -dvpos; i && IT_CHARPOS (*it) > BEGV; --i)