Added drag/drop #455
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Added drag/drop #455
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Fixes #232
Avalonia doesn't have this event, but it's needed in order to customize drag/drop operations.
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As described in #232, the
EnableTextDragDropoption did nothing because the code was commented out.This PR puts the drag/drop back, though there are some limitations compared to AvalonEdit's
GiveFeedback/QueryContinueDrag: these are win32 concepts and thus not exposed by AvaloniaDataObject.Pastingattached event: the event does not exist in AvaloniaAlthough
DataObject.Pastingis not supported, I added aDataObjectEx.Copyingevent as I consider being able to customize the copied data vital to this feature: it's been added asDataObjectEx.Copying. ThePastingevent could also be added here if needed but it's less important IMO.