[Advanced-Checklist] Re-ordering items when some are completed does not work #71

Within a group, when at least one item is completed, re-ordering uncompleted items does not work as intended: sometimes it just jumps back to its place, sometimes it goes to a different place than dragged to.

I highly suspect the completed items still keep their index and dragging an item then does no account for that.

EDIT: This is on mobile, I don't know if it works on the web.