* master: (124 commits)
  Double-check next value for internal ids.
  Resolve "skeleton placeholder on diff has white background"
  Replace the `project/commits/comments.feature` spinach test with an rspec analog
  Set ENV['IN_MEMORY_APPLICATION_SETTINGS'] to 'true in spec/db/production/settings_spec.rb
  Update docs on `.gitlab-ci.yml` and variables policy
  Add note about support of variables policy to docs
  Revert and fix
  corrected git cheat sheet url
  Bump parser gem to 2.5.1.0 to remove warning in rspec
  Update invalid test application_settings_controller_spec.rb
  Use stable docker image instead of latest
  Handle cancelled request
  Stop polling and fetch the table
  [ci skip] Updates table when stage is clicked
  Backport GitLab domain helper methods
  use jquery object in togglePopover
  Fix other listeners
  Fix the metrics link being not rendering the html
  Fix feature_highlight listener
  Update custom issue tracker docs
  ...