updated for version 7.4.318
Problem:    Check for whether a highlight group has settings ignores fg and bg
            color settings.
Solution:   Also check cterm and GUI color settings. (Christian Brabandt)
diff --git a/src/syntax.c b/src/syntax.c
index 5b86a29..a935810 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -8043,8 +8043,14 @@
 {
     return (   HL_TABLE()[idx].sg_term_attr != 0
 	    || HL_TABLE()[idx].sg_cterm_attr != 0
+	    || HL_TABLE()[idx].sg_cterm_fg != 0
+	    || HL_TABLE()[idx].sg_cterm_bg != 0
 #ifdef FEAT_GUI
 	    || HL_TABLE()[idx].sg_gui_attr != 0
+	    || HL_TABLE()[idx].sg_gui_fg_name != NULL
+	    || HL_TABLE()[idx].sg_gui_bg_name != NULL
+	    || HL_TABLE()[idx].sg_gui_sp_name != NULL
+	    || HL_TABLE()[idx].sg_font_name != NUL
 #endif
 	    || (check_link && (HL_TABLE()[idx].sg_set & SG_LINK)));
 }