Add gaplessgrid patch

config.def.h

@@ -66,10 +66,11 @@ static const int lockfullscreen = 1; /* 1 will force focus on the fullscreen win
 #include "layouts.c"
 
 static const Layout layouts[] = {
-	/* symbol     arrange function */
-	{ "[]=",      tile },    /* first entry is default */
-	{ "><>",      NULL },    /* no layout function means floating behavior */
-	{ "[M]",      monocle },
+	/* symbol		arrange function */
+	{ "###",		gaplessgrid },
+	{ "[]=",		tile },
+	{ "><>",		NULL },
+	{ "[M]",		monocle },
 };
 
 /* key definitions */