Don't reset target branch when choosing to "Change branches" in MR

app/helpers/merge_requests_helper.rb

@@ -49,8 +49,9 @@ module MergeRequestsHelper
         source_project_id: @merge_request.source_project_id,
         target_project_id: @merge_request.target_project_id,
         source_branch: @merge_request.source_branch,
-        target_branch: nil
-      }
+        target_branch: @merge_request.target_branch,
+      },
+      change_branches: true
     )
   end
 

app/views/projects/merge_requests/new.html.haml

@@ -1,7 +1,7 @@
 - page_title "New Merge Request"
 = render "header_title"
 
-- if @merge_request.can_be_created
+- if @merge_request.can_be_created && !params[:change_branches]
   = render 'new_submit'
 - else
   = render 'new_compare'

features/steps/project/forked_merge_requests.rb

@@ -112,7 +112,6 @@ class Spinach::Features::ProjectForkedMergeRequests < Spinach::FeatureSteps
   end
 
   step 'I fill out an invalid "Merge Request On Forked Project" merge request' do
-    select "Select branch", from: "merge_request_target_branch"
     expect(find(:select, "merge_request_source_project_id", {}).value).to eq @forked_project.id.to_s
     expect(find(:select, "merge_request_target_project_id", {}).value).to eq @project.id.to_s
     expect(find(:select, "merge_request_source_branch", {}).value).to eq ""