(font_sort_entites): Change the meaning of the arg

BEST-ONLY.  Don't optimize for VEC of lenght 1.
(font_select_entity): Just return the value of font_sort_entites.

src/font.c

@@ -2297,8 +2297,12 @@ struct font_sort_data
    pixel-size from QCdpi property of PREFER or from the Y-resolution
    of FRAME before sorting.
 
-   If BEST-ONLY is nonzero, return the best matching entity.  Otherwise,
-   return the sorted VEC.  */
+   If BEST-ONLY is nonzero, return the best matching entity (that
+   supports the character BEST-ONLY if BEST-ONLY is positive, or any
+   if BEST-ONLY is negative).  Otherwise, return the sorted VEC.
+
+   This function does no optimization for the case that the length of
+   VEC is 1.  The caller should avoid calling this in such a case.  */
 
 static Lisp_Object
 font_sort_entites (vec, prefer, frame, best_only)
@@ -2316,9 +2320,6 @@ font_sort_entites (vec, prefer, frame, best_only)
   USE_SAFE_ALLOCA;
 
   len = ASIZE (vec);
-  if (len <= 1)
-    return best_only ? AREF (vec, 0) : vec;
-
   for (i = FONT_WEIGHT_INDEX; i <= FONT_DPI_INDEX; i++)
     prefer_prop[i] = AREF (prefer, i);
   if (FLOATP (prefer_prop[FONT_SIZE_INDEX]))
@@ -2327,16 +2328,14 @@ font_sort_entites (vec, prefer, frame, best_only)
 
   /* Scoring and sorting.  */
   SAFE_ALLOCA (data, struct font_sort_data *, (sizeof *data) * len);
-  best_score = 0xFFFFFFFF;
   /* We are sure that the length of VEC > 1.  */
   driver_type = AREF (AREF (vec, 0), FONT_TYPE_INDEX);
   for (driver_order = 0, list = f->font_driver_list; list;
        driver_order++, list = list->next)
     if (EQ (driver_type, list->driver->type))
       break;
-  best_entity = data[0].entity = AREF (vec, 0);
-  best_score = data[0].score
-    = font_score (data[0].entity, prefer_prop) | driver_order;
+  best_score = 0xFFFFFFFF;
+  best_entity = Qnil;
   for (i = 0; i < len; i++)
     {
       if (!EQ (driver_type, AREF (AREF (vec, i), FONT_TYPE_INDEX)))
@@ -2345,7 +2344,10 @@ font_sort_entites (vec, prefer, frame, best_only)
 	  if (EQ (driver_type, list->driver->type))
 	    break;
       data[i].entity = AREF (vec, i);
-      data[i].score = font_score (data[i].entity, prefer_prop) | driver_order;
+      data[i].score
+	= (best_only <= 0 || font_has_char (f, data[i].entity, best_only) > 0
+	   ? font_score (data[i].entity, prefer_prop) | driver_order
+	   : 0xFFFFFFFF);
       if (best_only && best_score > data[i].score)
 	{
 	  best_score = data[i].score;
@@ -3213,37 +3215,8 @@ font_select_entity (frame, entities, attrs, pixel_size, c)
   if (NILP (AREF (prefer, FONT_WIDTH_INDEX)))
     FONT_SET_STYLE (prefer, FONT_WIDTH_INDEX, attrs[LFACE_SWIDTH_INDEX]);
   ASET (prefer, FONT_SIZE_INDEX, make_number (pixel_size));
-  entities = font_sort_entites (entities, prefer, frame, c < 0);
-
-  if (c < 0)
-    return entities;
-
-  for (i = 0; i < ASIZE (entities); i++)
-    {
-      int j;
 
-      font_entity = AREF (entities, i);
-#if 0
-      /* The following code is intended to avoid checking of
-	 font_has_char repeatedly for bitmap fonts that differs only
-	 in pixelsize.  But, it doesn't work well if fontconfig is
-	 configured to find BDF/PFC fonts.  */
-      if (i > 0)
-	{
-	  for (j = FONT_FOUNDRY_INDEX; j <= FONT_REGISTRY_INDEX; j++)
-	    if (! EQ (AREF (font_entity, j), props[j]))
-	      break;
-	  if (j > FONT_REGISTRY_INDEX)
-	    continue;
-	}
-      for (j = FONT_FOUNDRY_INDEX; j <= FONT_REGISTRY_INDEX; j++)
-	props[j] = AREF (font_entity, j);
-#endif
-      result = font_has_char (f, font_entity, c);
-      if (result > 0)
-	return font_entity;
-    }
-  return Qnil;
+  return font_sort_entites (entities, prefer, frame, c);
 }
 
 /* Return a font-entity satisfying SPEC and best matching with face's