fix for [ 1020924 ] wx.Display.IsPrimary is wrong

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30327 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/display.h

@@ -38,6 +38,8 @@ public:
     virtual wxVideoMode GetCurrentMode() const;
     virtual bool ChangeMode(const wxVideoMode& mode = wxVideoMode());
 
+    virtual bool IsPrimary() const;
+
 private:
     // get the display name to use with EnumDisplaySettings()
     wxString GetNameForEnumSettings() const;