(start_display): Don't try to determine the continuation

lines width if lines are truncated.  It's superfluous and leads to
incorrect results if POS is not visible in the window after
reseating the iterator at the previous line start.

diff --git a/src/ChangeLog b/src/ChangeLog
index eaaa46952eb5e34ab7aac4b98cfb29358c5daad2..1e9f0977f61438859acf79451d5c7e504ddeda4d 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2001-08-07  Gerd Moellmann  <gerd@gnu.org>
+
+       * xdisp.c (start_display): Don't try to determine the continuation
+       lines width if lines are truncated.  It's superfluous and leads to
+       incorrect results if POS is not visible in the window after
+       reseating the iterator at the previous line start.
+
 2001-08-06  Gerd Moellmann  <gerd@gnu.org>
 
        * xterm.c (x_dump_glyph_string): Put in #if GLYPH_DEBUG.

diff --git a/src/xdisp.c b/src/xdisp.c
index 88d8580361755a29377f6c34e0022cae244655d6..b5a28cb826ada0bcf8d3ab09c5fef25bc067d4bc 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -1705,36 +1705,32 @@ start_display (it, w, pos)
      struct window *w;
      struct text_pos pos;
 {
-  int start_at_line_beg_p;
   struct glyph_row *row;
   int first_vpos = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0;
-  int first_y;
 
   row = w->desired_matrix->rows + first_vpos;
   init_iterator (it, w, CHARPOS (pos), BYTEPOS (pos), row, DEFAULT_FACE_ID);
-  first_y = it->current_y;
-  
-  /* If window start is not at a line start, move back to the line
-     start.  This makes sure that we take continuation lines into
-     account.  */
-  start_at_line_beg_p = (CHARPOS (pos) == BEGV
-                        || FETCH_BYTE (BYTEPOS (pos) - 1) == '\n');
-  if (!start_at_line_beg_p)
-    reseat_at_previous_visible_line_start (it);
-
-  /* If window start is not at a line start, skip forward to POS to
-     get the correct continuation_lines_width and current_x.  */
-  if (!start_at_line_beg_p)
-    {
-      move_it_to (it, CHARPOS (pos), -1, -1, -1, MOVE_TO_POS);
-
-      /* If lines are continued, this line may end in the middle of a
-        multi-glyph character (e.g. a control character displayed as
-        \003, or in the middle of an overlay string).  In this case
-        move_it_to above will not have taken us to the start of
-        the continuation line but to the end of the continued line.  */
-      if (!it->truncate_lines_p)
+
+  if (!it->truncate_lines_p)
+    {
+      int start_at_line_beg_p;
+      int first_y = it->current_y;
+  
+      /* If window start is not at a line start, skip forward to POS to
+        get the correct continuation lines width.  */
+      start_at_line_beg_p = (CHARPOS (pos) == BEGV
+                            || FETCH_BYTE (BYTEPOS (pos) - 1) == '\n');
+      if (!start_at_line_beg_p)
        {
+         reseat_at_previous_visible_line_start (it);
+         move_it_to (it, CHARPOS (pos), -1, -1, -1, MOVE_TO_POS);
+
+         /* If lines are continued, this line may end in the middle
+            of a multi-glyph character (e.g. a control character
+            displayed as \003, or in the middle of an overlay
+            string).  In this case move_it_to above will not have
+            taken us to the start of the continuation line but to the
+            end of the continued line.  */
          if (it->current_x > 0)
            {
              if (it->current.dpvec_index >= 0
@@ -1743,7 +1739,7 @@ start_display (it, w, pos)
                  set_iterator_to_next (it, 1);
                  move_it_in_display_line_to (it, -1, -1, 0);
                }
-         
+             
              it->continuation_lines_width += it->current_x;
            }
 
@@ -1752,11 +1748,11 @@ start_display (it, w, pos)
             fields in the iterator structure.  */
          it->max_ascent = it->max_descent = 0;
          it->max_phys_ascent = it->max_phys_descent = 0;
-       }
       
-      it->current_y = first_y;
-      it->vpos = 0;
-      it->current_x = it->hpos = 0;
+         it->current_y = first_y;
+         it->vpos = 0;
+         it->current_x = it->hpos = 0;
+       }
     }
 
 #if 0 /* Don't assert the following because start_display is sometimes