Nested Drag Source + Touch

[BButner]

Describe the bug
I have a <ListView> as a Drop Target. Inside of the list view collection, I have a specific <Thumb> that is used as the Drag Source. When using the mouse it works perfectly. However, when using touch, it ends up scrolling the Scroll View, instead of grabbing the Drag Source.

To Reproduce
Steps to reproduce the behavior:

1. Create a <ListView> as a Drop Target
2. Create a ListViewItem Template that contains the Drag Source
3. Attempt to use a Touch Screen to grab the Drag Source
4. See that it starts to scroll, instead of dragging

Expected behavior
It should grab the Drag Source

Desktop (please complete the following information):

• OS: Windows 10

[BButner]

I'm able to somewhat work around this and accomplish what I want with:

private void UIElement_OnTouchDown( object sender, TouchEventArgs e )
{
	if( sender is not Thumb thumb ) return;

	DragDrop.DefaultDragHandler.StartDrag( new DragInfo( thumb, e )
	{
		Effects = DragDropEffects.Move, Data = thumb.DataContext
	} );

	e.Handled = true;
}

[IceDiam0nd]

I got the same issue, is there something new for this bug?

best regards,
Ivan

[IceDiam0nd]

I attached my test project, please try it with touch screen.

DragDropTest.zip

[Brains]

I'm able to somewhat work around this and accomplish what I want with:

@BButner did your workaround work well all way down to Drop moment?

Because I tried your solution with my custom TableDragHandler:

var handler = (TableDragHandler) border.FindResource("TableDragHandler");

but the next stage (that is TableDropHandler, custom as well) has received a bad data in DragOver method. 'Bad' means that CanAcceptData returns false due to dropInfo.DragInfo is null.