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4.3.0 -> 4.4.2 에서 달라진 것들

Improvement: fixed column implementation completed (code donation by Igor Savkic)
Change: OnMouseWheel published.
Improvement: Painting of normal, selected, state and overlay image is now done using standard image list access. This allows to use specialized image lists (e.g. with full alpha channel support).
Improvement: ShowScrollbar calls with conditional defines extracted into a new method. Added event that can be hooked by the application to get notified if a scrollbar is about to show or hide. Introduced OnShowScrollbar event.
Improvement: OnGetImageEx event to allow specifying a custom imagelist.
Improvement: GetFirstChecked, GetNextChecked, ClearChecked helper methods (code donation by Azza).
Bug fix: Reselection of a node in multi selection node did not refresh its visual selection appearance.
Bug fix: root node total count not updated during load of streamed nodes.
Bug fix: When loading a node from stream the initial total height is always set to the current default height of the tree, not the height of the node that is being loaded.
Bug fix: Mantis #260, TBaseVirtualTree.ReadChunk has applied total height of loaded nodes multiple times.
Change: Moved DoCancelEdit and DoEndEdit to the protected section.
Improvement: Hint window class dynamically assignable. TBaseVirtualTree.GetHintWindowClass
Change: A few GetPrevious* methods were still testing for an initialized parameter.
Change: OnMouseWheel published.
Improvement: Painting of normal, selected, state and overlay image is now done using standard image list access. This allows to use specialized image lists (e.g. with full alpha channel support).