patches by Rostislav Beneš: mc-15-dialog

changes in handlig keys,
if key is ascii characters, is clear what to do. But when key is between 0x80 and
0xff, it is impossible say, if is valid, alpha, number, ...
I think, that will be better support multibytes characters directly in message
handler, but is not necessary and my patch do not do that.

src/dialog.c

@@ -33,6 +33,7 @@
 #include "layout.h"	/* winch_flag */
 #include "execute.h"	/* suspend_cmd() */
 #include "main.h"	/* slow_terminal */
+#include "strutil.h"
 
 #define waddc(w,y1,x1,c) move (w->y+y1, w->x+x1); addch (c)
 
@@ -167,8 +168,8 @@ common_dialog_repaint (struct Dlg_head *h)
 
     if (h->title) {
 	attrset (DLG_HOT_NORMALC (h));
-	dlg_move (h, space, (h->cols - strlen (h->title)) / 2);
-	addstr (h->title);
+	dlg_move (h, space, (h->cols - str_term_width1 (h->title)) / 2);
+	addstr (str_term_form (h->title));
     }
 }
 
@@ -590,14 +591,16 @@ dlg_try_hotkey (Dlg_head *h, int d_key)
      */
 
     if (h->current->options & W_IS_INPUT) {
-	if (d_key < 255 && isalpha (d_key))
+        /* skip ascii control characters, anything else can valid character in
+         * some encoding */
+	if (d_key >= 32 && d_key < 256)
 	    return 0;
     }
 
     /* If it's an alt key, send the message */
     c = d_key & ~ALT (0);
-    if (d_key & ALT (0) && c < 255 && isalpha (c))
-	d_key = tolower (c);
+    if (d_key & ALT (0) && g_ascii_isalpha (c))
+	d_key = g_ascii_tolower (c);
 
     handled = 0;
     if (h->current->options & W_WANT_HOTKEY)