Allow drag_preview to be handled by a different viewport than its parent #64949
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Fixes #59622
For the visual scripting node dragging, we need to be able to differentiate between the viewport which will handle the drag preview position, and the viewport which will contain the preview in its tree.
I've done that by adding an optional parameter to the control's
force_drag
andset_drag_preview
methods, which defines the control that will be used to determine the preview's parent (the parameter defaults tothis
if left null).