message: fix column buttons not workign
diff: @@ -24,7 +24,7 @@ export const maybeAddColumnsButtons = makeBTDModule(({TD, jq}) => {
  overrideColumnPrototype(TD, jq);
  - jq(document).on('click', '.btd-clear-column-link', (ev) => {
  + jq(document).on('mousedown', '.btd-clear-column-link', (ev) => {
  ev.preventDefault();
  const element = ev.target;
  @@ -43,7 +43,7 @@ export const maybeAddColumnsButtons = makeBTDModule(({TD, jq}) => {
  });
  jq(document).on(
  - 'click',
  + 'mousedown',
  '.column-panel header.column-header .btd-toggle-collapse-column-link',
  (ev) => {
  ev.preventDefault();
  