===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/grid.c,v
retrieving revision 1.95
retrieving revision 1.96
diff -u -r1.95 -r1.96
--- src/usr.bin/tmux/grid.c	2019/05/26 17:34:45	1.95
+++ src/usr.bin/tmux/grid.c	2019/06/27 15:17:41	1.96
@@ -1,4 +1,4 @@
-/* $OpenBSD: grid.c,v 1.95 2019/05/26 17:34:45 nicm Exp $ */
+/* $OpenBSD: grid.c,v 1.96 2019/06/27 15:17:41 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -37,12 +37,12 @@
 
 /* Default grid cell data. */
 const struct grid_cell grid_default_cell = {
-	0, 0, 8, 8, { { ' ' }, 0, 1, 1 }
+	0, 0, 8, 8, 0, { { ' ' }, 0, 1, 1 }
 };
 
 /* Cleared grid cell data. */
 const struct grid_cell grid_cleared_cell = {
-	GRID_FLAG_CLEARED, 0, 8, 8, { { ' ' }, 0, 1, 1 }
+	GRID_FLAG_CLEARED, 0, 8, 8, 0, { { ' ' }, 0, 1, 1 }
 };
 static const struct grid_cell_entry grid_cleared_entry = {
 	GRID_FLAG_CLEARED, { .data = { 0, 8, 8, ' ' } }
@@ -81,6 +81,8 @@
 	if (gc->data.size != 1 || gc->data.width != 1)
 		return (1);
 	if ((gc->fg & COLOUR_FLAG_RGB) || (gc->bg & COLOUR_FLAG_RGB))
+		return (1);
+	if (gc->us != 0) /* only supports 256 or RGB */
 		return (1);
 	return (0);
 }