Incorporated a modified version of FXFoldingList from FOX 1.6.57.
Modifications were mostly done to the sort methods which now accept the specification of a column by which the caller wants to sort the list.
This could not be done the normal C++ way by inheritance because traversing folding items needs access to some private members of FXFoldingItem (like "prev", "next" etc.).
Incorporated a modified version of FXFoldingList from FOX 1.6.57.
Modifications were mostly done to the sort methods which now accept the
specification of a column by which the caller wants to sort the list.
This could not be done the normal C++ way by inheritance because traversing
folding items needs access to some private members of FXFoldingItem
(like "prev", "next" etc.).