message: fix(selection): check mouse target when anchor node is null
diff: @@ -64,7 +64,7 @@ export function createSelectTextStream(config: AppConfig | null) {
  ),
  withLatestFrom(mouseup$, clickPeriodCount$),
  map(([[selection, isWithMouse], mouseup, clickPeriodCount]) => {
  - const self = isInDictPanel(selection.anchorNode)
  + const self = isInDictPanel(selection.anchorNode || mouseup.target)
  if (config.noTypeField && isTypeField(selection.anchorNode)) {
  return self
  