Drag multiple ListBox items

[IncPlusPlus]

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Discussed in #109

^{Originally posted by IncPlusPlus September 13, 2022}
Hi there. Thanks for making such an awesome library. I was searching around trying to find out how to make an item draggable in Avalonia and almost gave up until I found this. I've figured out how to make a single ListBox item draggable. However, my SelectionMode is set to multiple so multiple items can be selected. When I select multiple items and then start to drag, all items except the one I started the drag action on get deselected. Is there a way to make dragging respect the existing selection of items in a ListBox?

I tried removing the drag & drop behavior and discovered that this issue seems to be with Avalonia specifically. If I start making a dragging motion, the selection is cleared.

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I made a discussion post a few months ago asking about this. As far as I can tell, dragging multiple items in a ListBox with SelectionMode="Multiple" is not possible. I've created this issue as an enhancement request.

Is it possible that support could be added for this scenario in the future? If not, do you know of a way I could avoid this issue? I was thinking maybe there was a way to stop the ListBoxItem from getting the PointerPressedEvent until it was followed by a PointerReleasedEvent && no drag had occurred. However, I'm not quite familiar enough with Avalonia to pull it off.