nl_tokens: append to prev sibling
pl_tokens: function appendPrev ( info ) { if ( isNodeDroppable ( info . targetPrev ) ) { th . appendTo ( info . dplh , info . targetPrev ) ; if ( ! info . targetPrev . open ) <mask> . store . toggleOpen ( info . targetPrev ) ; } else { insertDplhAfterTo ( info . dplh , info . targetPrev , info ) ; } }