Qt: ^V on OSX

I can't take credit for this and still have no idea why it is
needed, but it fixes use of ^V as a command and as input to
to the regular version of yn_function().  In particular, '&'
command reports it as ^V.  Unfortunately when 'popup_dialog' is
set, no control characters seem to be accepted by the part of
NetHackQtYnDialog(Exec+KeyPressEvent) responsible for arbitrary
input.

It also causes getlin() to terminate but I can't think of any
situation where ^V would be considered to be valid input for
getlin() so won't worry about that.

I put it in as '#if MACOSX' because I don't know whether any
other Qt platforms need it.

win/Qt/qt_main.cpp

@@ -10,6 +10,8 @@ extern "C" {
 
 #include "qt_pre.h"
 #include <QtGui/QtGui>
+#include <QtWidgets/QShortcut>
+
 #if QT_VERSION >= 0x050000
 #include <QtWidgets/QtWidgets>
 #endif
@@ -548,6 +550,13 @@ NetHackQtMainWindow::NetHackQtMainWindow(NetHackQtKeyBuffer& ks) :
      *  setMenuRole() can be used to override this behavior.
      */
 #endif
+
+#ifdef CTRL_V_HACK
+    // NetHackQtBind::notify() sees all control characters except for ^V
+    QShortcut *c_V = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_V), this);
+    connect(c_V, &QShortcut::activated, this, &NetHackQtMainWindow::CtrlV);
+#endif
+
     QMenu* game=new QMenu;
     QMenu* apparel=new QMenu;
     QMenu* act1=new QMenu;
@@ -889,6 +898,20 @@ NetHackQtMainWindow::NetHackQtMainWindow(NetHackQtKeyBuffer& ks) :
     }
 }
 
+#ifdef CTRL_V_HACK
+#ifndef C
+#define C(c) (0x1f & (c))
+#endif
+
+// called when ^V is typed while the main window has keyboard focus;
+// all other control characters go through NetHackQtBind::notify()
+void NetHackQtMainWindow::CtrlV()
+{
+    static const char cV[] = { C('V'), '\0' };
+    doKeys(cV);
+}
+#endif
+
 // add a toolbar button to invoke command 'name' via function '(*func)()'
 void NetHackQtMainWindow::AddToolButton(QToolBar *toolbar, QSignalMapper *sm,
                                         const char *name, int NDECL((*func)),