Make sure the main Gitlab::Markdown module gets loaded before filters

lib/gitlab/markdown/autolink_filter.rb

+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 require 'uri'
 

lib/gitlab/markdown/commit_range_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces commit range references with links.

lib/gitlab/markdown/commit_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces commit references with links.

lib/gitlab/markdown/cross_project_reference.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # Common methods for ReferenceFilters that support an optional cross-project

lib/gitlab/markdown/emoji_filter.rb

+require 'action_controller'
+require 'gitlab/markdown'
 require 'gitlab_emoji'
 require 'html/pipeline/filter'
-require 'action_controller'
 
 module Gitlab
   module Markdown

lib/gitlab/markdown/external_issue_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces external issue tracker references with links.

lib/gitlab/markdown/external_link_filter.rb

+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 
 module Gitlab

lib/gitlab/markdown/issue_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces issue references with links. References to

lib/gitlab/markdown/label_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces label references with links.

lib/gitlab/markdown/merge_request_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces merge request references with links. References

lib/gitlab/markdown/reference_filter.rb

 require 'active_support/core_ext/string/output_safety'
+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 
 module Gitlab

lib/gitlab/markdown/relative_link_filter.rb

+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 require 'uri'
 

lib/gitlab/markdown/sanitization_filter.rb

+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 require 'html/pipeline/sanitization_filter'
 

lib/gitlab/markdown/snippet_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces snippet references with links. References to

lib/gitlab/markdown/syntax_highlight_filter.rb

+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 require 'rouge/plugins/redcarpet'
 

lib/gitlab/markdown/table_of_contents_filter.rb

+require 'gitlab/markdown'
 require 'html/pipeline/filter'
 
 module Gitlab

lib/gitlab/markdown/task_list_filter.rb

+require 'gitlab/markdown'
 require 'task_list/filter'
 
 module Gitlab

lib/gitlab/markdown/user_reference_filter.rb

+require 'gitlab/markdown'
+
 module Gitlab
   module Markdown
     # HTML filter that replaces user or group references with links.