This reverts commit e00fb2bdc2090e9cabeb1eb35a2672a882cc96e9.

# Conflicts:
#	.rubocop.yml
#	.rubocop_todo.yml
#	lib/gitlab/ci/config/entry/global.rb
#	lib/gitlab/ci/config/entry/jobs.rb
#	spec/lib/gitlab/ci/config/entry/factory_spec.rb
#	spec/lib/gitlab/ci/config/entry/global_spec.rb
#	spec/lib/gitlab/ci/config/entry/job_spec.rb
#	spec/lib/gitlab/ci/status/build/factory_spec.rb
#	spec/lib/gitlab/incoming_email_spec.rb

This reverts commit cb10b725c8929b8b4460f89c9d96c773af39ba6b.

This reverts commit 96bef54154e669f9a3e92c3a4bc76c0be3a52e48.

This was wrong when there were over 100 files in the diff, because we
did not use the same diff options as subclasses of
`Gitlab::Diff::FileCollection::Base` when getting the raw diffs. (The
reason we don't use those classes directly is because they may perform
highlighting, which isn't needed for just counting the diffs.)

+ remove complete leftover when Issues were tagged using acts_as_taggable

after user click delete branch, there is no processing indication, and user can click many times till. It seems flaw in UX. this will fix it

fix bug in branch deletion link