[webui] add branch destination information

Show (and link to if it already exists) resulting project on the
'Branch Confirmation' Dialog.

Fixes openSUSE#2171

src/api/app/helpers/webui/package_helper.rb

@@ -88,4 +88,10 @@ def binaries?(xml_hash)
   def repo_type_and_priority(repository)
     [repository.repo_type, repository.priority].compact.join(', Priority: ')
   end
+
+  def package_link_dest(pack, opts = {})
+    opts[:project] = User.current.branch_project_name(pack.project.name)
+    opts[:short] = true
+    project_or_package_link(opts)
+  end
 end

src/api/app/views/webui/package/_branch_dialog.html.erb

@@ -3,7 +3,8 @@
       <h2 class="box-header">Branch Confirmation</h2>
       <div class="dialog-content">
         <p>
-         Do you really want to branch <%= package_link(@package) %>?<br /><br />
+        Do you want to branch <%= package_link(@package) %>
+        into <%= package_link_dest(@package) %>?<br /><br />
          <a data-target="#branching-options" data-hidetext="[-] Hide options" data-showtext="[+] More options" class="show-hide">[+] More options</a>
         </p>
       </div>

src/api/spec/features/webui/maintenance_workflow_spec.rb

@@ -34,7 +34,7 @@
     visit package_show_path(project: update_project, package: package)
 
     click_link('Branch package')
-    expect(page).to have_text('Do you really want to branch package')
+    expect(page).to have_text('Do you want to branch package')
 
     click_button('Ok')
     expect(page).to have_text('Successfully branched package')