Qt font selection dropdown menu

In "Qt settings" (or "Preferences" for OSX), the current font size
would show "Medium" if that was the current setting.  So far, so
good.  However, if you clicked on the up/down arrows to get the
dropdown menu, it was truncated to "Mediu" there regardless of
current setting.  Force the menu to be wide enough to show "Medium".

win/Qt/qt_set.cpp

@@ -141,6 +141,7 @@ NetHackQtSettings::NetHackQtSettings() :
     connect(&dollheight, SIGNAL(valueChanged(int)), this, SLOT(resizeDoll()));
 #endif
 
+    fontsize.setMinimumContentsLength((int) strlen("Medium"));
     fontsize.addItem("Huge");
     fontsize.addItem("Large");
     fontsize.addItem("Medium");