* xdisp.c (fill_stretch_glyph_string): Set s->nchars = 1 for code which

does last_glyph=s->first_glyph+s->nchars-1, e.g. if stretch has relief.

src/xdisp.c

@@ -18732,6 +18732,7 @@ fill_stretch_glyph_string (s, row, area, start, end)
   s->font = s->face->font;
   s->font_info = FONT_INFO_FROM_ID (s->f, s->face->font_info_id);
   s->width = glyph->pixel_width;
+  s->nchars = 1;
   voffset = glyph->voffset;
   for (++glyph;