Fix flexsearch arrow navigation error

document.addEventListener('keydown',suggestionFocus);

function suggestionFocus(e) {

  const suggestionsHidden = suggestions.classList.contains('d-none');

  if (suggestionsHidden) return;

  const focusableSuggestions= suggestions.querySelectorAll('a');

  const focusable= [...focusableSuggestions];

  const index = focusable.indexOf(document.activeElement);

  const focusableSuggestions= [...suggestions.querySelectorAll('a')];

  if (focusableSuggestions.length === 0) return;

  const keyDefault = suggestions.classList.contains('d-none');

  const index = focusableSuggestions.indexOf(document.activeElement);

  let nextIndex = 0;

  if ((e.keyCode === 38) && (!keyDefault)) {

  if (e.key === "ArrowUp") {

    e.preventDefault();

    nextIndex= index > 0 ? index-1 : 0;

    const nextIndex = index > 0 ? index - 1 : 0;

    focusableSuggestions[nextIndex].focus();

  }

  else if ((e.keyCode === 40) && (!keyDefault)) {

  else if (e.key === "ArrowDown") {

    e.preventDefault();

    nextIndex= index+1 < focusable.length ? index+1 : index;

    const nextIndex= index + 1 < focusableSuggestions.length ? index + 1 : index;

    focusableSuggestions[nextIndex].focus();

  }

    //flatSearch now returns results for each index field. create a single list

    const flatResults = {}; //keyed by href to dedupe results

    results.forEach(result=>{

        result.result.forEach(r=>{

          flatResults[r.doc.href] = r.doc;

        });

    });

    for (const result of results.flatMap(r => r.result)) {

      flatResults[result.doc.href] = result.doc;

    }

    //construct a list of suggestions list

    for(const href in flatResults) {