Merge branch 'project-move-dropdown-search' into 'master'

Fixed issue with move dropdown not being searchable

## What does this MR do?

Adds the ability to search the project move dropdown.

## What are the relevant issue numbers?

Closes #18634 

## Screenshots (if relevant)

![search](/uploads/f10a9a16b608308c1b3c66f186f57f80/search.gif)

See merge request !4666

app/assets/javascripts/issuable_form.js.coffee

@@ -102,6 +102,10 @@ class @IssuableForm
             return {
               results: data
             }
+          data: (query) ->
+            {
+              search: query
+            }
         formatResult: (project) ->
           project.name_with_namespace
         formatSelection: (project) ->

app/controllers/autocomplete_controller.rb

@@ -35,6 +35,7 @@ class AutocompleteController < ApplicationController
     project = Project.find_by_id(params[:project_id])
 
     projects = current_user.authorized_projects
+    projects = projects.search(params[:search]) if params[:search].present?
     projects = projects.select do |project|
       current_user.can?(:admin_issue, project)
     end

spec/features/issues/move_spec.rb

@@ -26,6 +26,7 @@ feature 'issue move to another project' do
   context 'user has permission to move issue' do
     let!(:mr) { create(:merge_request, source_project: old_project) }
     let(:new_project) { create(:project) }
+    let(:new_project_search) { create(:project) }
     let(:text) { 'Text with !1' }
     let(:cross_reference) { old_project.to_reference }
 
@@ -47,6 +48,21 @@ feature 'issue move to another project' do
       expect(page).to have_content(issue.title)
     end
 
+    scenario 'searching project dropdown', js: true do
+      new_project_search.team << [user, :reporter]
+
+      page.within '.js-move-dropdown' do
+        first('.select2-choice').click
+      end
+
+      fill_in('s2id_autogen2_search', with: new_project_search.name)
+
+      page.within '.select2-drop' do
+        expect(page).to have_content(new_project_search.name)
+        expect(page).not_to have_content(new_project.name)
+      end
+    end
+
     context 'user does not have permission to move the issue to a project', js: true do
       let!(:private_project) { create(:project, :private) }
       let(:another_project) { create(:project) }