http://www.midnight-commander.org/ticket/287
Index: mc-4.6.2/src/key.c
===================================================================
--- mc-4.6.2.orig/src/key.c	2009-02-01 19:30:21.000000000 +0000
+++ mc-4.6.2/src/key.c	2009-02-25 20:16:46.000000000 +0000
@@ -694,6 +694,8 @@
     /* F0 is the same as F10 for out purposes */
     if (c == KEY_F (0))
 	c = KEY_F (10);
+    if (c == KEY_F_IMMUTABLE (0))
+	c = KEY_F_IMMUTABLE (10);
 
     /*
      * We are not interested if Ctrl was pressed when entering control
@@ -765,6 +767,16 @@
 	mod &= ~KEY_M_SHIFT;
     }
 
+    /*
+     * Numerals may require modifilers with some keymaps or on obscure
+     * keyboards (e. g. F4 = Esc Shift+4). We have to ignore all
+     * modifiers while interpreting Esc + Numeral.
+     */
+    if (c >= KEY_F_IMMUTABLE (1) && c <= KEY_F_IMMUTABLE (10)) {
+	c += KEY_F (0) - KEY_F_IMMUTABLE (0);
+	mod &= ~KEY_M_MASK;
+    }
+
     if (!alternate_plus_minus)
 	switch (c) {
 	case KEY_KP_ADD:
@@ -917,10 +929,9 @@
 		this = this->next;
 	    else {
 		if (parent != NULL && parent->action == MCKEY_ESCAPE) {
-
 		    /* Convert escape-digits to F-keys */
 		    if (isdigit(c))
-			c = KEY_F (c - '0');
+			c = KEY_F_IMMUTABLE (c - '0');
 		    else if (c == ' ')
 			c = ESC_CHAR;
 		    else
Index: mc-4.6.2/src/myslang.h
===================================================================
--- mc-4.6.2.orig/src/myslang.h	2009-02-25 18:25:29.000000000 +0000
+++ mc-4.6.2/src/myslang.h	2009-02-25 18:25:31.000000000 +0000
@@ -29,6 +29,7 @@
 };
 
 #define KEY_F(x) (1000+x)
+#define KEY_F_IMMUTABLE(x) (970+x)
 
 #define ACS_VLINE SLSMG_VLINE_CHAR
 #define ACS_HLINE SLSMG_HLINE_CHAR