To show file and to start to go back.

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1210 disabled
autocomplete for personal snippets and project snippets. But we want
autocomplete on project snippets.

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33594

Was supposedly fixed in MR for
https://gitlab.com/gitlab-org/gitlab-ce/issues/32086 but seeing this pop
up again

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33598

Closes #33184

Backport Fix locked milestone in boards being remove-able.
See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1963

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/2433

Conflicts:
	app/assets/javascripts/boards/boards_bundle.js
	app/assets/javascripts/boards/filtered_search_boards.js
	app/assets/javascripts/filtered_search/filtered_search_manager.js
	spec/features/boards/boards_spec.rb

Single commit squash of all changes for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10878

It's needed due to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10777 being merged with squash.

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/31271

When the dropdown items are too wide, constrain the dropdown to the
offsetParent. Otherwise, let it naturally flow as Select2 wants.