Removes bugs with selection.

Adds deselect still a WIP.

app/assets/javascripts/gl_dropdown.js.coffee

@@ -264,14 +264,23 @@ class GitLabDropdown
   rowClicked: (el) ->
     fieldName = @options.fieldName
     field = @dropdown.parent().find("input[name='#{fieldName}']")     
+    selectedIndex = el.parent().index()
+    if @renderedData
+      selectedObject = @renderedData[selectedIndex]
+    value = if @options.id then @options.id(selectedObject, el) else selectedObject.id
+    field = @dropdown.parent().find("input[name='#{fieldName}'][value='#{value}']")
 
     if el.hasClass(ACTIVE_CLASS)
+      if @options.multiSelect
+        console.log field.val(), value
+      else
         field.remove()
     else
       fieldName = @options.fieldName
       selectedIndex = el.parent().index()
       if @renderedData
         selectedObject = @renderedData[selectedIndex]
+        selectedObject.selected = true
       value = if @options.id then @options.id(selectedObject, el) else selectedObject.id
 
       if !value?

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

@@ -85,8 +85,9 @@
             - else
               .light None
           .selectbox.hide-collapsed
+            = f.hidden_field 'label_name', value: issuable.labels.map(&:id).join(',')
             .dropdown
-              %button.dropdown-menu-toggle.js-label-select.js-multiselect{type: "button", data: {toggle: "dropdown", field_name: "label_name", show_no: "true", show_any: "true", selected: issuable.label_names.join(","), project_id: (@project.id if @project), issue_update: namespace_project_issue_path(@project.namespace, @project, issuable.id, :json), labels: (namespace_project_labels_path(@project.namespace, @project, :json) if @project)}}
+              %button.dropdown-menu-toggle.js-label-select.js-multiselect{type: "button", data: {toggle: "dropdown", field_name: "issue[label_name]", show_no: "true", show_any: "true", selected: issuable.label_names.join(","), project_id: (@project.id if @project), issue_update: namespace_project_issue_path(@project.namespace, @project, issuable.id, :json), labels: (namespace_project_labels_path(@project.namespace, @project, :json) if @project)}}
                 %span.dropdown-toggle-text
                   Label
                 = icon('chevron-down')