suggestions from <Someone>

doc/window.doc

@@ -157,6 +157,10 @@ char yn_function(const char *ques, const char *choices, char default)
 		   Place this value in the global "yn_number" and return '#'.
 		-- This uses the top line in the tty window-port, other
 		   ports might use a popup.
+		-- If choices is NULL, all possible inputs are accepted and
+		   returned, preserving case (upper or lower.) This means that
+		   if the calling function needs an exact match, it must handle
+		   user input correctness itself.
 getlin(const char *ques, char *input)
 		-- Prints ques as a prompt and reads a single line of text,
 		   up to a newline.  The string entered is returned without the

win/win32/mswproc.c

@@ -1431,9 +1431,8 @@ char mswin_yn_function(const char *question, const char *choices,
     while (result<0) {
         ShowCaret(mswin_hwnd_from_winid(WIN_MESSAGE));
 	ch=mswin_nhgetch();
-	if (choices == ynchars || choices == ynqchars ||
-		choices == ynaqchars || choices == ynNaqchars)
-	    ch = lowc(ch);
+	if (choices)
+		ch = lowc(ch);
         HideCaret(mswin_hwnd_from_winid(WIN_MESSAGE));
 	if (ch=='\033') {
 	    result=yn_esc_map;