Implement wxButtonBase::GetDefaultSize()

Implement wxButton::DoGetBestSize() to return at least 68 pixel width unless
wxBU_EXACTFIT flag is given.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29658 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/button.h

@@ -58,6 +58,7 @@ protected:
 public:
     wxString GetLabel() const;
     void SetLabel(const wxString& label);
+    wxSize DoGetBestSize() const;
 };
 
 #endif // __WX_COCOA_BUTTON_H__