Add option to select the null user as the default

app/assets/javascripts/users_select.js

@@ -30,7 +30,7 @@
       $els.each((function(_this) {
         return function(i, dropdown) {
           var options = {};
-          var $block, $collapsedSidebar, $dropdown, $loading, $selectbox, $value, abilityName, assignTo, assigneeTemplate, collapsedAssigneeTemplate, defaultLabel, firstUser, issueURL, selectedId, showAnyUser, showNullUser, showMenuAbove;
+          var $block, $collapsedSidebar, $dropdown, $loading, $selectbox, $value, abilityName, assignTo, assigneeTemplate, collapsedAssigneeTemplate, defaultLabel, defaultNullUser, firstUser, issueURL, selectedId, showAnyUser, showNullUser, showMenuAbove;
           $dropdown = $(dropdown);
           options.projectId = $dropdown.data('project-id');
           options.groupId = $dropdown.data('group-id');
@@ -38,6 +38,7 @@
           options.todoFilter = $dropdown.data('todo-filter');
           options.todoStateFilter = $dropdown.data('todo-state-filter');
           showNullUser = $dropdown.data('null-user');
+          defaultNullUser = $dropdown.data('null-user-default');
           showMenuAbove = $dropdown.data('showMenuAbove');
           showAnyUser = $dropdown.data('any-user');
           firstUser = $dropdown.data('first-user');
@@ -50,7 +51,8 @@
           $value = $block.find('.value');
           $collapsedSidebar = $block.find('.sidebar-collapsed-user');
           $loading = $block.find('.block-loading').fadeOut();
-          selectedId = $dropdown.data('selected') || showNullUser ? 0 : null;
+          selectedId = $dropdown.data('selected');
+          if (!selectedId) selectedId = (defaultNullUser && showNullUser) ? 0 : null;
 
           var updateIssueBoardsIssue = function () {
             $loading.removeClass('hidden').fadeIn();

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

@@ -48,7 +48,7 @@
 
         .selectbox.hide-collapsed
           = f.hidden_field 'assignee_id', value: issuable.assignee_id, id: 'issue_assignee_id'
-          = dropdown_tag('Select assignee', options: { toggle_class: 'js-user-search js-author-search', title: 'Assign to', filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: 'Search users', data: { first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), author_id: issuable.author_id, field_name: "#{issuable.to_ability_name}[assignee_id]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true, selected: issuable.assignee_id } })
+          = dropdown_tag('Select assignee', options: { toggle_class: 'js-user-search js-author-search', title: 'Assign to', filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: 'Search users', data: { first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), author_id: issuable.author_id, field_name: "#{issuable.to_ability_name}[assignee_id]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true, null_user_default: true, selected: issuable.assignee_id } })
 
       .block.milestone
         .sidebar-collapsed-icon