Fix cursor motion at end of line that ends with a composite character.

 xdisp.c (display_line): Use `reseat' instead of `reseat_1', and
 use `get_next_display_element' and `set_iterator_to_next' to
 advance to the next character, when looking for the character that
 begins the next row.

2 files changed, 16 insertions, 8 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 66fc3c1546b..7561d6ebf61 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,10 @@
 2010-04-24  Eli Zaretskii  <eliz@gnu.org>
 
+        * xdisp.c (display_line): Use `reseat' instead of `reseat_1', and
+        use `get_next_display_element' and `set_iterator_to_next' to
+        advance to the next character, when looking for the character that
+        begins the next row.
+
         * .gdbinit: Add a "set Fmake_symbol" line to force GDB to load the
         definition of "struct Lisp_Symbol".
 
diff --git a/src/xdisp.c b/src/xdisp.c
index 753ea16db01..5e5684a845d 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -17969,17 +17969,20 @@ display_line (it)
         }
       else if (row->used[TEXT_AREA] && max_pos)
         {
-          SET_TEXT_POS (tpos, max_pos + 1, CHAR_TO_BYTE (max_pos + 1));
+          SET_TEXT_POS (tpos, max_pos, CHAR_TO_BYTE (max_pos));
+          save_it = *it;
+          it->bidi_p = 0;
+          reseat (it, tpos, 0);
+          if (!get_next_display_element (it))
+            abort ();   /* row at ZV was already handled above */
+          set_iterator_to_next (it, 1);
           row_end = it->current;
-          row_end.pos = tpos;
           /* If the character at max_pos+1 is a newline, skip that as
              well.  Note that this may skip some invisible text.  */
-          if (FETCH_CHAR (tpos.bytepos) == '\n'
-              || (FETCH_CHAR (tpos.bytepos) == '\r' && it->selective))
+          if (!get_next_display_element (it))
+            abort ();
+          if (ITERATOR_AT_END_OF_LINE_P (it))
             {
-              save_it = *it;
-              it->bidi_p = 0;
-              reseat_1 (it, tpos, 0);
               set_iterator_to_next (it, 1);
               /* Record the position after the newline of a continued
                  row.  We will need that to set ROW->end of the last
@@ -17994,7 +17997,6 @@ display_line (it)
                   row_end = it->current;
                   save_it.eol_pos.charpos = save_it.eol_pos.bytepos = 0;
                 }
-              *it = save_it;
             }
           else if (!row->continued_p
                    && MATRIX_ROW_CONTINUATION_LINE_P (row)
@@ -18008,6 +18010,7 @@ display_line (it)
               row_end.pos = it->eol_pos;
               it->eol_pos.charpos = it->eol_pos.bytepos = 0;
             }
+          *it = save_it;
           row->end = row_end;
         }
     }