Removes target branch filter from dashboard merge requests

This filter does not work on the dashboard because
we it is not scoped to a project or group so we dont
have access to all the target branches.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/207481

app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js

 import { __ } from '~/locale';
 
-export default IssuableTokenKeys => {
+export default (IssuableTokenKeys, disableTargetBranchFilter = false) => {
   const draftToken = {
     token: {
       formattedKey: __('Draft'),
@@ -51,18 +51,20 @@ export default IssuableTokenKeys => {
   IssuableTokenKeys.tokenKeysWithAlternative.push(draftToken.token);
   IssuableTokenKeys.conditions.push(...draftToken.conditions);
 
-  const targetBranchToken = {
-    formattedKey: __('Target-Branch'),
-    key: 'target-branch',
-    type: 'string',
-    param: '',
-    symbol: '',
-    icon: 'arrow-right',
-    tag: 'branch',
-  };
+  if (!disableTargetBranchFilter) {
+    const targetBranchToken = {
+      formattedKey: __('Target-Branch'),
+      key: 'target-branch',
+      type: 'string',
+      param: '',
+      symbol: '',
+      icon: 'arrow-right',
+      tag: 'branch',
+    };
 
-  IssuableTokenKeys.tokenKeys.push(targetBranchToken);
-  IssuableTokenKeys.tokenKeysWithAlternative.push(targetBranchToken);
+    IssuableTokenKeys.tokenKeys.push(targetBranchToken);
+    IssuableTokenKeys.tokenKeysWithAlternative.push(targetBranchToken);
+  }
 
   const approvedBy = {
     token: {

app/assets/javascripts/pages/dashboard/merge_requests/index.js

@@ -5,7 +5,7 @@ import IssuableFilteredSearchTokenKeys from '~/filtered_search/issuable_filtered
 import { FILTERED_SEARCH } from '~/pages/constants';
 
 document.addEventListener('DOMContentLoaded', () => {
-  addExtraTokensForMergeRequests(IssuableFilteredSearchTokenKeys);
+  addExtraTokensForMergeRequests(IssuableFilteredSearchTokenKeys, true);
 
   initFilteredSearch({
     page: FILTERED_SEARCH.MERGE_REQUESTS,

app/views/dashboard/merge_requests.html.haml

@@ -14,7 +14,7 @@
 .top-area
   = render 'shared/issuable/nav', type: :merge_requests, display_count: !@no_filters_set
 
-= render 'shared/issuable/search_bar', type: :merge_requests
+= render 'shared/issuable/search_bar', type: :merge_requests, disable_target_branch: true
 
 - if current_user && @no_filters_set
   = render 'shared/dashboard/no_filter_selected'

app/views/shared/issuable/_search_bar.html.haml

 - type = local_assigns.fetch(:type)
 - board = local_assigns.fetch(:board, nil)
 - show_sorting_dropdown = local_assigns.fetch(:show_sorting_dropdown, true)
+- disable_target_branch = local_assigns.fetch(:disable_target_branch, false)
 - placeholder = local_assigns[:placeholder] || _('Search or filter results...')
 - is_not_boards_modal_or_productivity_analytics = type != :boards_modal && type != :productivity_analytics
 - block_css_class = is_not_boards_modal_or_productivity_analytics ? 'row-content-block second-block' : ''
@@ -154,11 +155,12 @@
                   %li.filter-dropdown-item{ data: { value: 'no', capitalize: true } }
                     %button.btn.btn-link{ type: 'button' }
                       = _('No')
-              #js-dropdown-target-branch.filtered-search-input-dropdown-menu.dropdown-menu
-                %ul.filter-dropdown{ data: { dynamic: true, dropdown: true } }
-                  %li.filter-dropdown-item
-                    %button.btn.btn-link.js-data-value.monospace
-                      {{title}}
+              - unless disable_target_branch
+                #js-dropdown-target-branch.filtered-search-input-dropdown-menu.dropdown-menu
+                  %ul.filter-dropdown{ data: { dynamic: true, dropdown: true } }
+                    %li.filter-dropdown-item
+                      %button.btn.btn-link.js-data-value.monospace
+                        {{title}}
 
               = render_if_exists 'shared/issuable/filter_weight', type: type
 

changelogs/unreleased/ph-207481-targetBranchFilterDashboard.yml

+---
+title: Disable target branch filter option on merge requests dashboard
+merge_request:
+author:
+type: fixed

ee/app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js

@@ -39,8 +39,8 @@ const approvers = {
   },
 };
 
-export default IssuableTokenKeys => {
-  addExtraTokensForMergeRequests(IssuableTokenKeys);
+export default (IssuableTokenKeys, disableTargetBranchFilter = false) => {
+  addExtraTokensForMergeRequests(IssuableTokenKeys, disableTargetBranchFilter);
   const tokenPosition = 2;
 
   IssuableTokenKeys.tokenKeys.splice(tokenPosition, 0, ...[approvers.token]);

spec/features/dashboard/merge_requests_spec.rb

@@ -19,6 +19,12 @@ RSpec.describe 'Dashboard Merge Requests' do
     sign_in(current_user)
   end
 
+  it 'disables target branch filter' do
+    visit merge_requests_dashboard_path
+
+    expect(page).not_to have_selector('#js-dropdown-target-branch', visible: false)
+  end
+
   context 'new merge request dropdown' do
     let(:project_with_disabled_merge_requests) { create(:project, :merge_requests_disabled) }