patch 7.4.1974

Problem:    GUI has a problem with some termcodes.
Solution:   Handle negative numbers. (Kazunobu Kuriyama)

src/gui.c

@@ -1773,7 +1773,7 @@ gui_write(
 	if (s[0] == ESC && s[1] == '|')
 	{
 	    p = s + 2;
-	    if (VIM_ISDIGIT(*p))
+	    if (VIM_ISDIGIT(*p) || (*p == '-' && VIM_ISDIGIT(*(p + 1))))
 	    {
 		arg1 = getdigits(&p);
 		if (p > s + len)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1974,
 /**/
     1973,
 /**/