[desktop_drop] Capture DnD events in the visible page

Our app has a typical master-detail setup, where dragging files into the master page will create a new entry, and doing it on the detail page will add to the existing entry.

The problem we're having is that when we drag items into the detail page, the master page also reacts to the drag-and-drop events, despite being in the background.

I believe this is due to how the Flutter Navigator works. We're using Navigator.push() to load the detail page, but it seems the master page is still active in the background. Normally this isn't an issue since touch events are captured by the topmost page.

Is there any recommendation on how to get around this? Better would be if the DropTarget could capture and consume those events itself.