Add the support for application escape mode

enable_appesc.vim

let &t_ti = &t_ti . "\e[?7727h"
let &t_te = "\e[?7727l" . &t_te
nmap <t_kx> <Esc>
imap <t_kx> <Esc>
vmap <t_kx> <Esc>
cmap <t_kx> <Esc>
omap <t_kx> <Esc>

support-app-esc-mode.diff

diff -r a42040fed96c src/keymap.h
--- a/src/keymap.h	Tue Jan 14 21:31:34 2014 +0100
+++ b/src/keymap.h	Sat Jan 18 12:05:19 2014 +0900
@@ -405,6 +405,8 @@
 #define K_K8		TERMCAP2KEY('K', 'K')	/* keypad 8 */
 #define K_K9		TERMCAP2KEY('K', 'L')	/* keypad 9 */
 
+#define K_APPESC	TERMCAP2KEY('k', 'x')	/* alternate escape key */
+
 #define K_MOUSE		TERMCAP2KEY(KS_MOUSE, KE_FILLER)
 #define K_MENU		TERMCAP2KEY(KS_MENU, KE_FILLER)
 #define K_VER_SCROLLBAR	TERMCAP2KEY(KS_VER_SCROLLBAR, KE_FILLER)
diff -r a42040fed96c src/term.c
--- a/src/term.c	Tue Jan 14 21:31:34 2014 +0100
+++ b/src/term.c	Sat Jan 18 12:05:19 2014 +0900
@@ -1000,6 +1000,11 @@
     {K_KPOINT,		IF_EB("\033O*n", ESC_STR "O*n")},	/* keypad . */
     {K_KDEL,		IF_EB("\033[3;*~", ESC_STR "[3;*~")},	/* keypad Del */
 
+    /* The alternate escape key code called as "application escape".
+     * http://code.google.com/p/mintty/wiki/CtrlSeqs#Escape_keycode
+     */
+    {K_APPESC,		IF_EB("\033O*[", ESC_STR "O*[")},
+
     {BT_EXTRA_KEYS,   ""},
     {TERMCAP2KEY('k', '0'), IF_EB("\033[10;*~", ESC_STR "[10;*~")}, /* F0 */
     {TERMCAP2KEY('F', '3'), IF_EB("\033[25;*~", ESC_STR "[25;*~")}, /* F13 */