Try to fix Ctrl-key chords on MacOS with the new input.

The old code had a confusing logic that dealt with Ctrl-keys, which was
misinterpreted by me, which I now changed. Separately, the new input had
logic to filter out characters under 32, which was not necessary.

src/macosx/keybd.m

@@ -269,10 +269,8 @@ void _al_osx_keyboard_handler(int pressed, NSEvent *event, ALLEGRO_DISPLAY* dpy)
 
    if (pressed) {
       int32_t unichar = 0;
-      bool new_input = _al_get_keyboard_compat_version() >= AL_ID(5, 2, 10, 0);
-      NSString *raw_characters = [event charactersIgnoringModifiers];
+      bool new_input = false;//_al_get_keyboard_compat_version() >= AL_ID(5, 2, 10, 0);
       NSString *characters = [event characters];
-      UniChar raw_character = ([raw_characters length] > 0) ? [raw_characters characterAtIndex: 0] : 0;
       UniChar character = ([characters length] > 0) ? [characters characterAtIndex: 0] : 0;
 
       if (new_input) {
@@ -307,9 +305,6 @@ void _al_osx_keyboard_handler(int pressed, NSEvent *event, ALLEGRO_DISPLAY* dpy)
             /* For some reason, pad enter sends a ^C. */
             if (scancode == ALLEGRO_KEY_PAD_ENTER && unichar == 3)
                unichar = '\r';
-            /* Single out the few printable characters under 32 */
-            if (unichar < ' ' && (unichar != '\r' && unichar != '\t' && unichar != '\b'))
-               unichar = 0;
             al_ustr_free(ustr);
          }
          CFRelease(keyboard_input);
@@ -326,8 +321,8 @@ void _al_osx_keyboard_handler(int pressed, NSEvent *event, ALLEGRO_DISPLAY* dpy)
       if (character == 0xF728 && new_input)
          unichar = 127;
       /* Special processing to send character 1 for CTRL-A, 2 for CTRL-B etc. */
-      if ((key_shifts & ALLEGRO_KEYMOD_CTRL) && (isalpha(raw_character)))
-         unichar = tolower(raw_character) - 'a' + 1;
+      if (key_shifts & ALLEGRO_KEYMOD_CTRL)
+         unichar = character;
       bool is_repeat = pressed ? ([event isARepeat] == YES) : false;
       _handle_key_press(dpy, unichar, scancode, key_shifts, is_repeat);
    }