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Add rejection of invalid glyphs for tui input

--- a/tui_main.c

+++ b/tui_main.c

@@ -124,6 +124,25 @@

   return Glyph_class_unknown;

 }

+static bool is_valid_glyph(Glyph c) {

+  if (c >= '0' && c <= '9')

+    return true;

+  if (c >= 'A' && c <= 'Z')

+    return true;

+  if (c >= 'a' && c <= 'z')

+    return true;

+  switch (c) {

+  case '!':

+  case '.':

+  case '*':

+  case ':':

+  case ';':

+  case '#':

+    return true;

+  }

+  return false;

+}

+

 static int term_attrs_of_cell(Glyph g, Mark m) {

   Glyph_class gclass = glyph_class_of(g);

   int attr = A_normal;

@@ -1587,7 +1606,7 @@

       app_state.is_draw_dirty = true;

       break;

     default:

-      if (key >= '!' && key <= '~') {

+      if (key >= CHAR_MIN && key <= CHAR_MAX && is_valid_glyph((Glyph)key)) {

         app_input_character(&app_state, (char)key);

       }

       break;