Add IMG hack nodes to the end of the last mark, rather than after them
Add IMG hack nodes to the end of the last mark, rather than after them

FIX: Work around a hidden cursor issue in Chrome when a textblock ends in an uneditable
node wrapped in a mark.

Issue https://github.com/ProseMirror/prosemirror/issues/1261

ProseMirror/prosemirror-view