Started new dropdown

app/assets/javascripts/boards/stores/boards_store.js.es6

@@ -65,8 +65,11 @@
           return label.title === boardFrom.title;
         });
       } else {
-        if (boardTo.label !== null) {
-          BoardsStore.removeIssueFromBoard(issue, boardFrom);
+        if (boardTo.label) {
+          if (boardFrom.id !== 'backlog') {
+            BoardsStore.removeIssueFromBoard(issue, boardFrom);
+          }
+          
           foundLabel = _.find(issue.labels, (label) => {
             return label.title === boardTo.title;
           });

app/assets/stylesheets/pages/boards.scss

@@ -2,6 +2,19 @@
   display: none;
 }
 
+.dropdown-menu-issues-board-new {
+  width: 320px;
+}
+
+.issue-board-dropdown-content {
+  padding: 0px 8px;
+
+  > p {
+    margin: 0;
+    color: #9c9c9c;
+  }
+}
+
 .issue-boards-page {
   .page-with-sidebar {
     display: flex;

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

@@ -30,8 +30,18 @@
           - if controller.controller_name != 'boards'
             = render 'shared/sort_dropdown'
           - else
-            %button.btn.btn-create{ type: "button" }
-              Create new list
+            .dropdown
+              %button.btn.btn-create{ type: "button", data: { toggle: "dropdown" } }
+                Create new list
+              .dropdown-menu.dropdown-menu-paging.dropdown-menu-align-right.dropdown-menu-issues-board-new
+                = dropdown_title("Create a new list")
+                .issue-board-dropdown-content
+                  %p
+                    Add a list to issue boards by selecting a label below. The list will automatically be populated with issues that have that label. To create a list for a label that doesn't exist yet, simply create the label below.
+                = render partial: "shared/issuable/label_page_default", locals: { show_title: false, show_footer: true, show_create: true }
+                - if can?(current_user, :admin_label, @project)
+                  = render partial: "shared/issuable/label_page_create"
+                = dropdown_loading
 
     - if controller.controller_name == 'issues'
       .issues_bulk_update.hide

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

 - title = local_assigns.fetch(:title, 'Assign labels')
 - show_create = local_assigns.fetch(:show_create, true)
 - show_footer = local_assigns.fetch(:show_footer, true)
+- show_title = local_assigns.fetch(:show_title, true)
 - filter_placeholder = local_assigns.fetch(:filter_placeholder, 'Search labels')
 .dropdown-page-one
-  = dropdown_title(title)
+  - if show_title
+    = dropdown_title(title)
   = dropdown_filter(filter_placeholder)
   = dropdown_content
   - if @project && show_footer