* xdisp.c (draw_glyphs): Set clipping to highlight boundaries.

2 files changed, 16 insertions, 4 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 5d06882cee7..cc16cf8f274 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2014-05-12  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+        * xdisp.c (draw_glyphs): Set clipping to highlight boundaries.
+
 2014-05-12  Glenn Morris  <rgm@gnu.org>
 
         * fileio.c (Ffile_executable_p): Doc tweak.
diff --git a/src/xdisp.c b/src/xdisp.c
index 6728a0275ea..ab492d098d0 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -24589,13 +24589,16 @@ draw_glyphs (struct window *w, int x, struct glyph_row *row,
           else
             overlap_hl = DRAW_NORMAL_TEXT;
 
+          if (hl != overlap_hl)
+            clip_head = head;
           j = i;
           BUILD_GLYPH_STRINGS (j, start, h, t,
                                overlap_hl, dummy_x, last_x);
           start = i;
           compute_overhangs_and_x (t, head->x, 1);
           prepend_glyph_string_lists (&head, &tail, h, t);
-          clip_head = head;
+          if (clip_head == NULL)
+            clip_head = head;
         }
 
       /* Prepend glyph strings for glyphs in front of the first glyph
@@ -24616,7 +24619,8 @@ draw_glyphs (struct window *w, int x, struct glyph_row *row,
           else
             overlap_hl = DRAW_NORMAL_TEXT;
 
-          clip_head = head;
+          if (hl == overlap_hl || clip_head == NULL)
+            clip_head = head;
           BUILD_GLYPH_STRINGS (i, start, h, t,
                                overlap_hl, dummy_x, last_x);
           for (s = h; s; s = s->next)
@@ -24640,13 +24644,16 @@ draw_glyphs (struct window *w, int x, struct glyph_row *row,
           else
             overlap_hl = DRAW_NORMAL_TEXT;
 
+          if (hl != overlap_hl)
+            clip_tail = tail;
           BUILD_GLYPH_STRINGS (end, i, h, t,
                                overlap_hl, x, last_x);
           /* Because BUILD_GLYPH_STRINGS updates the first argument,
              we don't have `end = i;' here.  */
           compute_overhangs_and_x (h, tail->x + tail->width, 0);
           append_glyph_string_lists (&head, &tail, h, t);
-          clip_tail = tail;
+          if (clip_tail == NULL)
+            clip_tail = tail;
         }
 
       /* Append glyph strings for glyphs following the last glyph
@@ -24664,7 +24671,8 @@ draw_glyphs (struct window *w, int x, struct glyph_row *row,
           else
             overlap_hl = DRAW_NORMAL_TEXT;
 
-          clip_tail = tail;
+          if (hl == overlap_hl || clip_tail == NULL)
+            clip_tail = tail;
           i++;                  /* We must include the Ith glyph.  */
           BUILD_GLYPH_STRINGS (end, i, h, t,
                                overlap_hl, x, last_x);