CList: How to make "Click'n'Drag", "Shift-Click", "Ctrl-Click" , working?

[Nils Philippsen <nils rhlx01 rz fht-esslingen de>]

Hello,

I still fiddle with extending the file selection and still don't have a clue
how to make CList (multiple selection) behave this way:

- Single click w/o modifiers clears all selected, selects the one clicked on
(or deselects it if it was selected)

- shift-click applies the last action (selection/deselection) from the last
affected list element up to the one clicked on.

- ctrl-click / ctrl-shift-click works like the above, just extends the
selection

- click'n'drag works like shift-click, as if you clicked, then released the
first element, then shift-clicked the last element.

Has anyone got any hints how deep I must dig to accomplish these things?

Nils
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