Qt prompt highlighting

When qt_yn_function() or qt_more() is asking for a single character
response, typing anything will cause the prompt line in the message
window to stop being highlighted.  If they reject what's been typed,
they beep (--More-- doesn't start beeping until second rejection);
change both of them to also rehighlight the prompt line to give a
visual indication that the question/acknowledgement is still being
asked.

win/Qt/qt_msg.cpp

@@ -184,6 +184,14 @@ void NetHackQtMessageWindow::AddToStr(const char *answer)
     }
 }
 
+// used when yn_function() or more() rejects player's input and tries again
+void NetHackQtMessageWindow::RehighlightPrompt()
+{
+    // selects most recent message, which causes it to be highlighted
+    if (list && list->count())
+        list->setCurrentRow(list->count() - 1);
+}
+
 // are there any highlighted messages?
 bool NetHackQtMessageWindow::hilit_mesgs()
 {