* upstream/develop: (89 commits)
  remove needless ref
  show preview popover when hover numbered replies
  refactor conditions
  do not make too many nested div
  add fetchStatus action
  refactor status loading logic
  split status preview popover into a separate component
  uninstall mobile-detect library
  listen both events
  minor css fix
  restrict distance at top side only
  set different trigger event in desktop and mobile by default
  fix eslint warnings
  fix popper go behind the top bar
  migrate Popper to v-popover
  fix popper go behind the top bar
  fix eslint warnings
  reset font-size to normal text size using rem
  use top placement by default
  hide status preview popper when hover popper content
  ...