fixed GetItemSpacing() inconsistency by deprecating the old function and adding a new, easier to use, overload

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23576 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/listctrl.cpp

@@ -4757,6 +4757,13 @@ void wxGenericListCtrl::SetItemSpacing( int spacing, bool isSmall )
     m_mainWin->SetItemSpacing( spacing, isSmall );
 }
 
+wxSize wxGenericListCtrl::GetItemSpacing() const
+{
+    const int spacing = GetItemSpacing(HasFlag(wxLC_SMALL_ICON));
+
+    return wxSize(spacing, spacing);
+}
+
 int wxGenericListCtrl::GetItemSpacing( bool isSmall ) const
 {
     return m_mainWin->GetItemSpacing( isSmall );