Remove Redcarpet markdown engine

This engine was replaced with CommonMarker in 11.4, it was deprecated
since then.

35 files changed, 27 insertions, 170 deletions

diff --git a/app/assets/javascripts/behaviors/preview_markdown.js b/app/assets/javascripts/behaviors/preview_markdown.js
index 35f1bb6b080..7adccbb062f 100644
--- a/app/assets/javascripts/behaviors/preview_markdown.js
+++ b/app/assets/javascripts/behaviors/preview_markdown.js
@@ -28,16 +28,13 @@ MarkdownPreview.prototype.ajaxCache = {};
 
 MarkdownPreview.prototype.showPreview = function($form) {
   var mdText;
-  var markdownVersion;
-  var url;
   var preview = $form.find('.js-md-preview');
+  var url = preview.data('url');
   if (preview.hasClass('md-preview-loading')) {
     return;
   }
 
   mdText = $form.find('textarea.markdown-area').val();
-  markdownVersion = $form.attr('data-markdown-version');
-  url = this.versionedPreviewPath(preview.data('url'), markdownVersion);
 
   if (mdText.trim().length === 0) {
     preview.text(this.emptyMessage);
@@ -67,16 +64,6 @@ MarkdownPreview.prototype.showPreview = function($form) {
   }
 };
 
-MarkdownPreview.prototype.versionedPreviewPath = function(markdownPreviewPath, markdownVersion) {
-  if (typeof markdownVersion === 'undefined') {
-    return markdownPreviewPath;
-  }
-
-  return `${markdownPreviewPath}${
-    markdownPreviewPath.indexOf('?') === -1 ? '?' : '&'
-  }markdown_version=${markdownVersion}`;
-};
-
 MarkdownPreview.prototype.fetchMarkdownPreview = function(text, url, success) {
   if (!url) {
     return;
diff --git a/app/assets/javascripts/issue_show/components/app.vue b/app/assets/javascripts/issue_show/components/app.vue
index fea7f0d77a5..bd757a76ee7 100644
--- a/app/assets/javascripts/issue_show/components/app.vue
+++ b/app/assets/javascripts/issue_show/components/app.vue
@@ -108,11 +108,6 @@ export default {
       type: String,
       required: true,
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
     projectPath: {
       type: String,
       required: true,
@@ -313,7 +308,6 @@ export default {
         :issuable-templates="issuableTemplates"
         :markdown-docs-path="markdownDocsPath"
         :markdown-preview-path="markdownPreviewPath"
-        :markdown-version="markdownVersion"
         :project-path="projectPath"
         :project-namespace="projectNamespace"
         :show-delete-button="showDeleteButton"
diff --git a/app/assets/javascripts/issue_show/components/fields/description.vue b/app/assets/javascripts/issue_show/components/fields/description.vue
index 90258c0e044..299130e56ae 100644
--- a/app/assets/javascripts/issue_show/components/fields/description.vue
+++ b/app/assets/javascripts/issue_show/components/fields/description.vue
@@ -20,11 +20,6 @@ export default {
       type: String,
       required: true,
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
     canAttachFile: {
       type: Boolean,
       required: false,
@@ -48,7 +43,6 @@ export default {
     <markdown-field
       :markdown-preview-path="markdownPreviewPath"
       :markdown-docs-path="markdownDocsPath"
-      :markdown-version="markdownVersion"
       :can-attach-file="canAttachFile"
       :enable-autocomplete="enableAutocomplete"
     >
diff --git a/app/assets/javascripts/issue_show/components/form.vue b/app/assets/javascripts/issue_show/components/form.vue
index 45b60bc3392..eade31f1d14 100644
--- a/app/assets/javascripts/issue_show/components/form.vue
+++ b/app/assets/javascripts/issue_show/components/form.vue
@@ -39,11 +39,6 @@ export default {
       type: String,
       required: true,
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
     projectPath: {
       type: String,
       required: true,
@@ -101,7 +96,6 @@ export default {
       :form-state="formState"
       :markdown-preview-path="markdownPreviewPath"
       :markdown-docs-path="markdownDocsPath"
-      :markdown-version="markdownVersion"
       :can-attach-file="canAttachFile"
       :enable-autocomplete="enableAutocomplete"
     />
diff --git a/app/assets/javascripts/notes.js b/app/assets/javascripts/notes.js
index c3443c300e3..c9c01354333 100644
--- a/app/assets/javascripts/notes.js
+++ b/app/assets/javascripts/notes.js
@@ -1239,15 +1239,13 @@ export default class Notes {
     var postUrl = $originalContentEl.data('postUrl');
     var targetId = $originalContentEl.data('targetId');
     var targetType = $originalContentEl.data('targetType');
-    var markdownVersion = $originalContentEl.data('markdownVersion');
 
     this.glForm = new GLForm($editForm.find('form'), this.enableGFM);
 
     $editForm
       .find('form')
       .attr('action', `${postUrl}?html=true`)
-      .attr('data-remote', 'true')
-      .attr('data-markdown-version', markdownVersion);
+      .attr('data-remote', 'true');
     $editForm.find('.js-form-target-id').val(targetId);
     $editForm.find('.js-form-target-type').val(targetType);
     $editForm
diff --git a/app/assets/javascripts/notes/components/comment_form.vue b/app/assets/javascripts/notes/components/comment_form.vue
index d669ba5a8fa..1d6cb9485f7 100644
--- a/app/assets/javascripts/notes/components/comment_form.vue
+++ b/app/assets/javascripts/notes/components/comment_form.vue
@@ -39,11 +39,6 @@ export default {
       type: String,
       required: true,
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
   },
   data() {
     return {
@@ -342,7 +337,6 @@ Please check your network connection and try again.`;
               :markdown-preview-path="markdownPreviewPath"
               :markdown-docs-path="markdownDocsPath"
               :quick-actions-docs-path="quickActionsDocsPath"
-              :markdown-version="markdownVersion"
               :add-spacing-classes="false"
             >
               <textarea
diff --git a/app/assets/javascripts/notes/components/note_body.vue b/app/assets/javascripts/notes/components/note_body.vue
index bcf5d334da4..ff303d0f55a 100644
--- a/app/assets/javascripts/notes/components/note_body.vue
+++ b/app/assets/javascripts/notes/components/note_body.vue
@@ -111,7 +111,6 @@ export default {
       :line="line"
       :note="note"
       :help-page-path="helpPagePath"
-      :markdown-version="note.cached_markdown_version"
       @handleFormUpdate="handleFormUpdate"
       @cancelForm="formCancelHandler"
     />
diff --git a/app/assets/javascripts/notes/components/note_form.vue b/app/assets/javascripts/notes/components/note_form.vue
index 269b4a4b117..92258a25438 100644
--- a/app/assets/javascripts/notes/components/note_form.vue
+++ b/app/assets/javascripts/notes/components/note_form.vue
@@ -26,11 +26,6 @@ export default {
       required: false,
       default: '',
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
     saveButtonTitle: {
       type: String,
       required: false,
@@ -202,7 +197,6 @@ export default {
       <markdown-field
         :markdown-preview-path="markdownPreviewPath"
         :markdown-docs-path="markdownDocsPath"
-        :markdown-version="markdownVersion"
         :quick-actions-docs-path="quickActionsDocsPath"
         :line="line"
         :note="discussionNote"
diff --git a/app/assets/javascripts/notes/components/notes_app.vue b/app/assets/javascripts/notes/components/notes_app.vue
index f3fcfdfda05..5edceea043c 100644
--- a/app/assets/javascripts/notes/components/notes_app.vue
+++ b/app/assets/javascripts/notes/components/notes_app.vue
@@ -44,11 +44,6 @@ export default {
       required: false,
       default: true,
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
     helpPagePath: {
       type: String,
       required: false,
@@ -216,10 +211,6 @@ export default {
       </template>
     </ul>
 
-    <comment-form
-      v-if="!commentsDisabled"
-      :noteable-type="noteableType"
-      :markdown-version="markdownVersion"
-    />
+    <comment-form v-if="!commentsDisabled" :noteable-type="noteableType" />
   </div>
 </template>
diff --git a/app/assets/javascripts/notes/index.js b/app/assets/javascripts/notes/index.js
index 2f715c85fa6..4883266dae5 100644
--- a/app/assets/javascripts/notes/index.js
+++ b/app/assets/javascripts/notes/index.js
@@ -18,7 +18,6 @@ document.addEventListener('DOMContentLoaded', () => {
       const notesDataset = document.getElementById('js-vue-notes').dataset;
       const parsedUserData = JSON.parse(notesDataset.currentUserData);
       const noteableData = JSON.parse(notesDataset.noteableData);
-      const markdownVersion = parseInt(notesDataset.markdownVersion, 10);
       let currentUserData = {};
 
       noteableData.noteableType = notesDataset.noteableType;
@@ -37,7 +36,6 @@ document.addEventListener('DOMContentLoaded', () => {
       return {
         noteableData,
         currentUserData,
-        markdownVersion,
         notesData: JSON.parse(notesDataset.notesData),
       };
     },
@@ -47,7 +45,6 @@ document.addEventListener('DOMContentLoaded', () => {
           noteableData: this.noteableData,
           notesData: this.notesData,
           userData: this.currentUserData,
-          markdownVersion: this.markdownVersion,
         },
       });
     },
diff --git a/app/assets/javascripts/vue_shared/components/markdown/field.vue b/app/assets/javascripts/vue_shared/components/markdown/field.vue
index cc07ef46064..3f607aa2a0a 100644
--- a/app/assets/javascripts/vue_shared/components/markdown/field.vue
+++ b/app/assets/javascripts/vue_shared/components/markdown/field.vue
@@ -27,11 +27,6 @@ export default {
       type: String,
       required: true,
     },
-    markdownVersion: {
-      type: Number,
-      required: false,
-      default: 0,
-    },
     addSpacingClasses: {
       type: Boolean,
       required: false,
@@ -158,7 +153,7 @@ export default {
         this.markdownPreviewLoading = true;
         this.markdownPreview = __('Loading…');
         this.$http
-          .post(this.versionedPreviewPath(), { text })
+          .post(this.markdownPreviewPath, { text })
           .then(resp => resp.json())
           .then(data => this.renderMarkdown(data))
           .catch(() => new Flash(__('Error loading markdown preview')));
@@ -186,13 +181,6 @@ export default {
         .then(() => $(this.$refs['markdown-preview']).renderGFM())
         .catch(() => new Flash(__('Error rendering markdown preview')));
     },
-
-    versionedPreviewPath() {
-      const { markdownPreviewPath, markdownVersion } = this;
-      return `${markdownPreviewPath}${
-        markdownPreviewPath.indexOf('?') === -1 ? '?' : '&'
-      }markdown_version=${markdownVersion}`;
-    },
   },
 };
 </script>
diff --git a/app/controllers/concerns/preview_markdown.rb b/app/controllers/concerns/preview_markdown.rb
index 4b0f0b8255c..f72d25fc54c 100644
--- a/app/controllers/concerns/preview_markdown.rb
+++ b/app/controllers/concerns/preview_markdown.rb
@@ -16,8 +16,6 @@ module PreviewMarkdown
       else {}
       end
 
-    markdown_params[:markdown_engine] = result[:markdown_engine]
-
     render json: {
       body: view_context.markdown(result[:text], markdown_params),
       references: {
diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index 0fee29bf7c7..1a471034972 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -268,7 +268,6 @@ module IssuablesHelper
       issuableRef: issuable.to_reference,
       markdownPreviewPath: preview_markdown_path(parent),
       markdownDocsPath: help_page_path('user/markdown'),
-      markdownVersion: issuable.cached_markdown_version,
       lockVersion: issuable.lock_version,
       issuableTemplates: issuable_templates(issuable),
       initialTitleHtml: markdown_field(issuable, :title),
diff --git a/app/helpers/markup_helper.rb b/app/helpers/markup_helper.rb
index 0d638b850b4..66f4b7b3f30 100644
--- a/app/helpers/markup_helper.rb
+++ b/app/helpers/markup_helper.rb
@@ -116,7 +116,6 @@ module MarkupHelper
 
   def markup(file_name, text, context = {})
     context[:project] ||= @project
-    context[:markdown_engine] ||= :redcarpet unless commonmark_for_repositories_enabled?
     html = context.delete(:rendered) || markup_unsafe(file_name, text, context)
     prepare_for_rendering(html, context)
   end
@@ -132,7 +131,6 @@ module MarkupHelper
       page_slug: wiki_page.slug,
       issuable_state_filter_enabled: true
     )
-    context[:markdown_engine] ||= :redcarpet unless commonmark_for_repositories_enabled?
 
     html =
       case wiki_page.format
@@ -187,10 +185,6 @@ module MarkupHelper
     end
   end
 
-  def commonmark_for_repositories_enabled?
-    Feature.enabled?(:commonmark_for_repositories, default_enabled: true)
-  end
-
   private
 
   # Return +text+, truncated to +max_chars+ characters, excluding any HTML
diff --git a/app/helpers/notes_helper.rb b/app/helpers/notes_helper.rb
index 293dd20ad49..aaf38cbfe70 100644
--- a/app/helpers/notes_helper.rb
+++ b/app/helpers/notes_helper.rb
@@ -171,7 +171,6 @@ module NotesHelper
       registerPath: new_session_path(:user, redirect_to_referer: 'yes', anchor: 'register-pane'),
       newSessionPath: new_session_path(:user, redirect_to_referer: 'yes'),
       markdownDocsPath: help_page_path('user/markdown'),
-      markdownVersion: issuable.cached_markdown_version,
       quickActionsDocsPath: help_page_path('user/project/quick_actions'),
       closePath: close_issuable_path(issuable),
       reopenPath: reopen_issuable_path(issuable),
diff --git a/app/helpers/projects_helper.rb b/app/helpers/projects_helper.rb
index 85248a16f50..e1d6e22b90b 100644
--- a/app/helpers/projects_helper.rb
+++ b/app/helpers/projects_helper.rb
@@ -265,10 +265,6 @@ module ProjectsHelper
     link_to 'BFG', 'https://rtyley.github.io/bfg-repo-cleaner/', target: '_blank', rel: 'noopener noreferrer'
   end
 
-  def legacy_render_context(params)
-    params[:legacy_render] ? { markdown_engine: :redcarpet } : {}
-  end
-
   def explore_projects_tab?
     current_page?(explore_projects_path) ||
       current_page?(trending_explore_projects_path) ||
diff --git a/app/models/concerns/cache_markdown_field.rb b/app/models/concerns/cache_markdown_field.rb
index 588204c7470..5fa6f79bdaa 100644
--- a/app/models/concerns/cache_markdown_field.rb
+++ b/app/models/concerns/cache_markdown_field.rb
@@ -13,7 +13,6 @@ module CacheMarkdownField
   extend ActiveSupport::Concern
 
   # Increment this number every time the renderer changes its output
-  CACHE_REDCARPET_VERSION         = 3
   CACHE_COMMONMARK_VERSION_START  = 10
   CACHE_COMMONMARK_VERSION        = 14
 
@@ -42,18 +41,6 @@ module CacheMarkdownField
     end
   end
 
-  class MarkdownEngine
-    def self.from_version(version = nil)
-      return :common_mark if version.nil? || version == 0
-
-      if version < CacheMarkdownField::CACHE_COMMONMARK_VERSION_START
-        :redcarpet
-      else
-        :common_mark
-      end
-    end
-  end
-
   def skip_project_check?
     false
   end
@@ -71,7 +58,7 @@ module CacheMarkdownField
     # Banzai is less strict about authors, so don't always have an author key
     context[:author] = self.author if self.respond_to?(:author)
 
-    context[:markdown_engine] = MarkdownEngine.from_version(latest_cached_markdown_version)
+    context[:markdown_engine] = :common_mark
 
     context
   end
@@ -128,17 +115,7 @@ module CacheMarkdownField
   end
 
   def latest_cached_markdown_version
-    return CacheMarkdownField::CACHE_COMMONMARK_VERSION unless cached_markdown_version
-
-    if legacy_markdown?
-      CacheMarkdownField::CACHE_REDCARPET_VERSION
-    else
-      CacheMarkdownField::CACHE_COMMONMARK_VERSION
-    end
-  end
-
-  def legacy_markdown?
-    cached_markdown_version && cached_markdown_version.between?(1, CacheMarkdownField::CACHE_COMMONMARK_VERSION_START - 1)
+    CacheMarkdownField::CACHE_COMMONMARK_VERSION
   end
 
   included do
diff --git a/app/models/repository.rb b/app/models/repository.rb
index e6ab3b484a2..9ae13fbaa80 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -614,7 +614,6 @@ class Repository
     return unless readme
 
     context = { project: project }
-    context[:markdown_engine] = :redcarpet unless MarkupHelper.commonmark_for_repositories_enabled?
 
     MarkupHelper.markup_unsafe(readme.name, readme.data, context)
   end
diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index 842d59d26a0..ef991eaf234 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -270,9 +270,7 @@ class IssuableBaseService < BaseService
     tasklist_toggler = TaskListToggleService.new(issuable.description, issuable.description_html,
                                                  line_source: update_task_params[:line_source],
                                                  line_number: update_task_params[:line_number].to_i,
-                                                 toggle_as_checked: update_task_params[:checked],
-                                                 index: update_task_params[:index].to_i,
-                                                 sourcepos: !issuable.legacy_markdown?)
+                                                 toggle_as_checked: update_task_params[:checked])
 
     unless tasklist_toggler.execute
       # if we make it here, the data is much newer than we thought it was - fail fast
diff --git a/app/services/preview_markdown_service.rb b/app/services/preview_markdown_service.rb
index a449a5dc3e9..c1655c38095 100644
--- a/app/services/preview_markdown_service.rb
+++ b/app/services/preview_markdown_service.rb
@@ -10,8 +10,7 @@ class PreviewMarkdownService < BaseService
       text: text,
       users: users,
       suggestions: suggestions,
-      commands: commands.join(' '),
-      markdown_engine: markdown_engine
+      commands: commands.join(' ')
     )
   end
 
@@ -49,12 +48,4 @@ class PreviewMarkdownService < BaseService
   def commands_target_id
     params[:quick_actions_target_id]
   end
-
-  def markdown_engine
-    if params[:legacy_render]
-      :redcarpet
-    else
-      CacheMarkdownField::MarkdownEngine.from_version(params[:markdown_version].to_i)
-    end
-  end
 end
diff --git a/app/services/task_list_toggle_service.rb b/app/services/task_list_toggle_service.rb
index 2717fc9035a..b5c4cd3235d 100644
--- a/app/services/task_list_toggle_service.rb
+++ b/app/services/task_list_toggle_service.rb
@@ -5,17 +5,13 @@
 # We don't care if the text has changed above or below the specific checkbox, as long
 # the checkbox still exists at exactly the same line number and the text is equal.
 # If successful, new values are available in `updated_markdown` and `updated_markdown_html`
-#
-# Note: once we've removed RedCarpet support, we can remove the `index` and `sourcepos`
-# parameters
 class TaskListToggleService
   attr_reader :updated_markdown, :updated_markdown_html
 
-  def initialize(markdown, markdown_html, line_source:, line_number:, toggle_as_checked:, index:, sourcepos: true)
+  def initialize(markdown, markdown_html, line_source:, line_number:, toggle_as_checked:)
     @markdown, @markdown_html  = markdown, markdown_html
     @line_source, @line_number = line_source, line_number
     @toggle_as_checked         = toggle_as_checked
-    @index, @use_sourcepos     = index, sourcepos
 
     @updated_markdown, @updated_markdown_html = nil
   end
@@ -28,8 +24,8 @@ class TaskListToggleService
 
   private
 
-  attr_reader :markdown, :markdown_html, :index, :toggle_as_checked
-  attr_reader :line_source, :line_number, :use_sourcepos
+  attr_reader :markdown, :markdown_html, :toggle_as_checked
+  attr_reader :line_source, :line_number
 
   def toggle_markdown
     source_lines      = markdown.split("\n")
@@ -68,17 +64,8 @@ class TaskListToggleService
   end
 
   # When using CommonMark, we should be able to use the embedded `sourcepos` attribute to
-  # target the exact line in the DOM.  For RedCarpet, we need to use the index of the checkbox
-  # that was checked and match it with what we think is the same checkbox.
-  # The reason `sourcepos` is slightly more reliable is the case where a line of text is
-  # changed from a regular line into a checkbox (or vice versa).  Then the checked index
-  # in the UI will be off from the list of checkboxes we've calculated locally.
-  # It's a rare circumstance, but since we can account for it, we do.
+  # target the exact line in the DOM.
   def get_html_checkbox(html)
-    if use_sourcepos
-      html.css(".task-list-item[data-sourcepos^='#{line_number}:'] > input.task-list-item-checkbox").first
-    else
-      html.css('.task-list-item-checkbox')[index - 1]
-    end
+    html.css(".task-list-item[data-sourcepos^='#{line_number}:'] > input.task-list-item-checkbox").first
   end
 end
diff --git a/app/views/projects/_wiki.html.haml b/app/views/projects/_wiki.html.haml
index 45e1d32980c..de4653dad2c 100644
--- a/app/views/projects/_wiki.html.haml
+++ b/app/views/projects/_wiki.html.haml
@@ -2,7 +2,7 @@
   %div{ class: container_class }
     .prepend-top-default.append-bottom-default
       .wiki
-        = render_wiki_content(@wiki_home, legacy_render_context(params))
+        = render_wiki_content(@wiki_home)
 - else
   - can_create_wiki = can?(current_user, :create_wiki, @project)
   .landing{ class: [('row-content-block row p-0 align-items-center' if can_create_wiki), ('content-block' unless can_create_wiki)] }
diff --git a/app/views/projects/blob/edit.html.haml b/app/views/projects/blob/edit.html.haml
index 3f2d96b70e5..4520cca8cf5 100644
--- a/app/views/projects/blob/edit.html.haml
+++ b/app/views/projects/blob/edit.html.haml
@@ -21,7 +21,7 @@
           Write
 
       %li
-        = link_to '#preview', 'data-preview-url' => project_preview_blob_path(@project, @id, legacy_render: params[:legacy_render]) do
+        = link_to '#preview', 'data-preview-url' => project_preview_blob_path(@project, @id) do
           = editing_preview_title(@blob.name)
 
     = form_tag(project_update_blob_path(@project, @id), method: :put, class: 'js-quick-submit js-requires-input js-edit-blob-form', data: blob_editor_paths(@project)) do
diff --git a/app/views/projects/blob/preview.html.haml b/app/views/projects/blob/preview.html.haml
index ff460a3831c..66687f087ff 100644
--- a/app/views/projects/blob/preview.html.haml
+++ b/app/views/projects/blob/preview.html.haml
@@ -2,7 +2,7 @@
   .diff-content
     - if markup?(@blob.name)
       .file-content.wiki.md{ class: ('use-csslab' if Feature.enabled?(:csslab)) }
-        = markup(@blob.name, @content, legacy_render_context(params))
+        = markup(@blob.name, @content)
     - else
       .file-content.code.js-syntax-highlight
         - unless @diff_lines.empty?
diff --git a/app/views/projects/blob/viewers/_markup.html.haml b/app/views/projects/blob/viewers/_markup.html.haml
index 6edbfd91b21..1a77eb078be 100644
--- a/app/views/projects/blob/viewers/_markup.html.haml
+++ b/app/views/projects/blob/viewers/_markup.html.haml
@@ -1,6 +1,4 @@
 - blob = viewer.blob
-- context = legacy_render_context(params)
-- unless context[:markdown_engine] == :redcarpet
-  - context[:rendered] = blob.rendered_markup if blob.respond_to?(:rendered_markup)
+- context = blob.respond_to?(:rendered_markup) ? { rendered: blob.rendered_markup } : {}
 .file-content.wiki.md{ class: ('use-csslab' if Feature.enabled?(:csslab)) }
   = markup(blob.name, blob.data, context)
diff --git a/app/views/projects/issues/_form.html.haml b/app/views/projects/issues/_form.html.haml
index 1e4e9450ffa..1be1087b36f 100644
--- a/app/views/projects/issues/_form.html.haml
+++ b/app/views/projects/issues/_form.html.haml
@@ -1,4 +1,3 @@
 = form_for [@project.namespace.becomes(Namespace), @project, @issue],
-           html: { class: 'issue-form common-note-form js-quick-submit js-requires-input' },
-           data: { markdown_version: @issue.cached_markdown_version } do |f|
+           html: { class: 'issue-form common-note-form js-quick-submit js-requires-input' } do |f|
   = render 'shared/issuable/form', f: f, issuable: @issue
diff --git a/app/views/projects/merge_requests/_form.html.haml b/app/views/projects/merge_requests/_form.html.haml
index 13b967beba1..a7c9e54506d 100644
--- a/app/views/projects/merge_requests/_form.html.haml
+++ b/app/views/projects/merge_requests/_form.html.haml
@@ -1,4 +1,3 @@
 = form_for [@project.namespace.becomes(Namespace), @project, @merge_request],
-           html: { class: 'merge-request-form common-note-form js-requires-input js-quick-submit' },
-           data: { markdown_version: @merge_request.cached_markdown_version } do |f|
+           html: { class: 'merge-request-form common-note-form js-requires-input js-quick-submit' } do |f|
   = render 'shared/issuable/form', f: f, issuable: @merge_request, presenter: @mr_presenter
diff --git a/app/views/projects/milestones/_form.html.haml b/app/views/projects/milestones/_form.html.haml
index 19f5bba75c4..5cc6b5a173b 100644
--- a/app/views/projects/milestones/_form.html.haml
+++ b/app/views/projects/milestones/_form.html.haml
@@ -1,6 +1,5 @@
 = form_for [@project.namespace.becomes(Namespace), @project, @milestone],
-           html: { class: 'milestone-form common-note-form js-quick-submit js-requires-input' },
-           data: { markdown_version: @milestone.cached_markdown_version } do |f|
+           html: { class: 'milestone-form common-note-form js-quick-submit js-requires-input' } do |f|
   = form_errors(@milestone)
   .row
     .col-md-6
diff --git a/app/views/projects/tags/releases/edit.html.haml b/app/views/projects/tags/releases/edit.html.haml
index 52c6c7ec424..e4efeed04f0 100644
--- a/app/views/projects/tags/releases/edit.html.haml
+++ b/app/views/projects/tags/releases/edit.html.haml
@@ -12,8 +12,7 @@
 
 
   = form_for(@release, method: :put, url: project_tag_release_path(@project, @tag.name),
-             html: { class: 'common-note-form release-form js-quick-submit' },
-             data: { markdown_version: @release.cached_markdown_version }) do |f|
+             html: { class: 'common-note-form release-form js-quick-submit' }) do |f|
     = render layout: 'projects/md_preview', locals: { url: preview_markdown_path(@project), referenced_users: true } do
       = render 'projects/zen', f: f, attr: :description, classes: 'note-textarea', placeholder: "Write your release notes or drag files here…"
       = render 'shared/notes/hints'
diff --git a/app/views/projects/wikis/_form.html.haml b/app/views/projects/wikis/_form.html.haml
index d1556dbd077..5bb69563b51 100644
--- a/app/views/projects/wikis/_form.html.haml
+++ b/app/views/projects/wikis/_form.html.haml
@@ -1,13 +1,9 @@
 - commit_message = @page.persisted? ? s_("WikiPageEdit|Update %{page_title}") : s_("WikiPageCreate|Create %{page_title}")
 - commit_message = commit_message % { page_title: @page.title }
-- if params[:legacy_render] || !commonmark_for_repositories_enabled?
-  - markdown_version = CacheMarkdownField::CACHE_REDCARPET_VERSION
-- else
-  - markdown_version = 0
 
 = form_for [@project.namespace.becomes(Namespace), @project, @page], method: @page.persisted? ? :put : :post,
            html: { class: 'wiki-form common-note-form prepend-top-default js-quick-submit' },
-           data: { markdown_version: markdown_version, uploads_path: uploads_path } do |f|
+           data: { uploads_path: uploads_path } do |f|
   = form_errors(@page)
 
   - if @page.persisted?
diff --git a/app/views/projects/wikis/_sidebar.html.haml b/app/views/projects/wikis/_sidebar.html.haml
index 02c5a6ea55c..28353927135 100644
--- a/app/views/projects/wikis/_sidebar.html.haml
+++ b/app/views/projects/wikis/_sidebar.html.haml
@@ -12,7 +12,7 @@
     .blocks-container
       .block.block-first
         - if @sidebar_page
-          = render_wiki_content(@sidebar_page, legacy_render_context(params))
+          = render_wiki_content(@sidebar_page)
         - else
           %ul.wiki-pages
             = render @sidebar_wiki_entries, context: 'sidebar'
diff --git a/app/views/projects/wikis/show.html.haml b/app/views/projects/wikis/show.html.haml
index 8b348bb4e4f..8e1c054b50c 100644
--- a/app/views/projects/wikis/show.html.haml
+++ b/app/views/projects/wikis/show.html.haml
@@ -27,6 +27,6 @@
 
 .prepend-top-default.append-bottom-default
   .wiki.md{ class: ('use-csslab' if Feature.enabled?(:csslab)) }
-    = render_wiki_content(@page, legacy_render_context(params))
+    = render_wiki_content(@page)
 
 = render 'sidebar'
diff --git a/app/views/search/results/_snippet_blob.html.haml b/app/views/search/results/_snippet_blob.html.haml
index e0130f9a4b5..a60a4501557 100644
--- a/app/views/search/results/_snippet_blob.html.haml
+++ b/app/views/search/results/_snippet_blob.html.haml
@@ -21,7 +21,7 @@
       .file-content.wiki
         - snippet_chunks.each do |chunk|
           - unless chunk[:data].empty?
-            = markup(snippet.file_name, chunk[:data], legacy_render_context(params))
+            = markup(snippet.file_name, chunk[:data])
           - else
             .file-content.code
               .nothing-here-block= _("Empty file")
diff --git a/app/views/shared/notes/_note.html.haml b/app/views/shared/notes/_note.html.haml
index cb5c64fb91d..41d6ae79c81 100644
--- a/app/views/shared/notes/_note.html.haml
+++ b/app/views/shared/notes/_note.html.haml
@@ -54,7 +54,7 @@
         .note-text.md
           = markdown_field(note, :note)
         = edited_time_ago_with_tooltip(note, placement: 'bottom', html_class: 'note_edited_ago')
-        .original-note-content.hidden{ data: { post_url: note_url(note), target_id: note.noteable.id, target_type: note.noteable.class.name.underscore, markdown_version: note.cached_markdown_version } }
+        .original-note-content.hidden{ data: { post_url: note_url(note), target_id: note.noteable.id, target_type: note.noteable.class.name.underscore } }
           #{note.note}
         - if note_editable
           = render 'shared/notes/edit', note: note
diff --git a/app/views/shared/snippets/_form.html.haml b/app/views/shared/snippets/_form.html.haml
index cf9c3055499..3007da0c189 100644
--- a/app/views/shared/snippets/_form.html.haml
+++ b/app/views/shared/snippets/_form.html.haml
@@ -3,8 +3,7 @@
 
 .snippet-form-holder
   = form_for @snippet, url: url,
-             html: { class: "snippet-form js-requires-input js-quick-submit common-note-form" },
-             data: { markdown_version: @snippet.cached_markdown_version } do |f|
+             html: { class: "snippet-form js-requires-input js-quick-submit common-note-form" } do |f|
     = form_errors(@snippet)
 
     .form-group.row