necessarily the root edit of that post, which is what we
             really want as a draft key so that the draft does not
             disappear if firt is later edited (giving us a new firt
             value here). */
            || fpid
        );
        let releaseLock;
        if( window.navigator.locks ){
        if( window.navigator?.locks ){
          releaseLock = await new Promise((resolve)=>{
            window.navigator.locks.request(
              'fossil-'+draftKey,
              {ifAvailable: true},
              async (lock) => {
                if( !lock ){
                  /*lock contention*/