Robert de Bath's patch: ARG_DEFAULT is now zero because it's

apparently defined behaviour for _all_ CSI-type sequences that ESC[Q
should be equivalent to ESC[0Q. Which is a pain in the wossname and
not a sane way to do it, but if the standards say it then I suppose
... :-(

[originally from svn r406]

terminal.c

@@ -41,7 +41,7 @@ static int alt_t, alt_b;
 static int alt_which;
 
 #define ARGS_MAX 32		       /* max # of esc sequence arguments */
-#define ARG_DEFAULT -1		       /* if an arg isn't specified */
+#define ARG_DEFAULT 0		       /* if an arg isn't specified */
 #define def(a,d) ( (a) == ARG_DEFAULT ? (d) : (a) )
 static int esc_args[ARGS_MAX];
 static int esc_nargs;