curses moving left with ^H

Typing ^H actually passed a 16-bit value back to the core which got
interpreted as ^G after the extra bits were discarded.  I don't think
any previous changes to the curses interface caused this.  It's
astonishing that no one ever noticed; the world must be full of numpad
users.

win/curses/cursmesg.c

@@ -661,7 +661,7 @@ curses_message_win_getline(const char *prompt, char *answer, int buffer)
             goto alldone;
         case '\177': /* DEL/Rubout */
         case KEY_DC: /* delete-character */
-        case '\b': /* ^H (Backspace: '\011') */
+        case '\b': /* ^H (Backspace: '\010') */
         case KEY_BACKSPACE:
             if (len < 1) {
                 len = 1;

win/curses/cursmisc.c

@@ -792,6 +792,13 @@ curses_convert_keys(int key)
 
     /* Handle arrow keys */
     switch (key) {
+    case KEY_BACKSPACE:
+        /* we can't distinguish between a separate backspace key and
+           explicit Ctrl+H intended to rush to the left; without this,
+           a value for ^H greater than 255 is passed back to core's
+           readchar() and stripping the value down to 0..255 yields ^G! */
+        ret = C('H');
+        break;
     case KEY_LEFT:
         if (iflags.num_pad) {
             ret = '4';