Drag and drop a list of references

I don't know if it's a troubleshooting or a feature request but :

when you want to drag and drop a list of references from one collection to another AND if you have selected both a reference and its sub-items (typically when you press CTRL+A after a quick reserach), it's not possible to drag and drop, but you have no indication why the drag and drop was not authorized.

If you select only the same items without their children, the drag and drop is working.

This behaviour is not ergonomic because the user could spend a lot of time without understanding why it's not working. You expect the drag and drop to work even if this situation (Zotero should be able to understand that if you drega and drop an item with its children, it's excatly the same that dragging and droping the parent item).

By the way, a option 'Add to collection' with a submenu listing the collections (of all personnal and shared librairies) would be welcomed in the right click menu.
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