Remove controller instance variables that are in the mergerequest

app/controllers/projects/merge_requests_controller.rb

@@ -145,14 +145,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     build_merge_request
     @noteable = @merge_request
 
-    @target_branches = if @merge_request.target_project
-                         @merge_request.target_project.repository.branch_names
-                       else
-                         []
-                       end
-
-    @target_project = merge_request.target_project
-    @source_project = merge_request.source_project
     @commits = @merge_request.compare_commits.reverse
     @commit = @merge_request.diff_head_commit
     @base_commit = @merge_request.diff_base_commit

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

@@ -82,7 +82,7 @@
 
 :javascript
   new Compare({
-    targetProjectUrl: "#{update_branches_namespace_project_merge_requests_path(@source_project.namespace, @source_project)}",
-    sourceBranchUrl: "#{branch_from_namespace_project_merge_requests_path(@source_project.namespace, @source_project)}",
-    targetBranchUrl: "#{branch_to_namespace_project_merge_requests_path(@source_project.namespace, @source_project)}"
+    targetProjectUrl: "#{update_branches_namespace_project_merge_requests_path(@merge_request.source_project.namespace, @merge_request.source_project)}",
+    sourceBranchUrl: "#{branch_from_namespace_project_merge_requests_path(@merge_request.source_project.namespace, @merge_request.source_project)}",
+    targetBranchUrl: "#{branch_to_namespace_project_merge_requests_path(@merge_request.source_project.namespace, @merge_request.source_project)}"
   });

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

@@ -54,7 +54,7 @@
           .issuable-form-select-holder
             = users_select_tag("#{issuable.class.model_name.param_key}[assignee_id]",
                 placeholder: 'Select assignee', class: 'custom-form-control', null_user: true,
-                selected: issuable.assignee_id, project: @target_project || @project,
+                selected: issuable.assignee_id, project: issuable.respond_to?(:target_project) && issuable.target_project || @project,
                 first_user: true, current_user: true, include_blank: true)
           %div
             = link_to 'Assign to me', '#', class: 'assign-to-me-link prepend-top-5 inline'