Make sure no negative depths are computed for clipboard metadata
Make sure no negative depths are computed for clipboard metadata

mattberkowitz/prosemirror,tzuhsiulin/prosemirror,kiejo/prosemirror,kiejo/prosemirror,salzhrani/prosemirror,adrianheine/prosemirror,jacwright/prosemirror,jacwright/prosemirror,adrianheine/prosemirror,adrianheine/prosemirror,salzhrani/prosemirror,salzhrani/prosemirror,tzuhsiulin/prosemirror,mattberkowitz/prosemirror,tzuhsiulin/prosemirror,kiejo/prosemirror