Append selected users to the user dropdown

app/assets/javascripts/gl_dropdown.js

@@ -468,8 +468,8 @@ GitLabDropdown = (function() {
 
     // Process the data to make sure rendered data
     // matches the correct layout
-    if (this.fullData && hasMultiSelect && this.options.processData) {
-      const inputValue = this.filterInput.val();
+    const inputValue = this.filterInput.val();
+    if (this.fullData && hasMultiSelect && this.options.processData && inputValue.length === 0) {
       this.options.processData.call(this.options, inputValue, this.filteredFullData(), this.parseData.bind(this));
     }
 
@@ -755,6 +755,12 @@ GitLabDropdown = (function() {
       $input.attr('id', this.options.inputId);
     }
 
+    if (this.options.multiSelect) {
+      Object.keys(selectedObject).forEach((attribute) => {
+        $input.attr(`data-${attribute}`, selectedObject[attribute]);
+      });
+    }
+
     if (this.options.inputMeta) {
       $input.attr('data-meta', selectedObject[this.options.inputMeta]);
     }

app/assets/javascripts/users_select.js

@@ -214,7 +214,37 @@ function UsersSelect(currentUser, els) {
             glDropdown.options.processData(term, users, callback);
           }.bind(this));
         },
-        processData: function(term, users, callback) {
+        processData: function(term, data, callback) {
+          let users = data;
+
+          if ($dropdown.hasClass('js-multiselect') && term.length === 0) {
+            let selectedInputs = getSelectedUserInputs();
+
+            // Potential duplicate entries when dealing with issue board
+            // because issue board is also managed by vue
+            selectedInputs = _.uniq(selectedInputs, false, a => a.value);
+
+            const selectedUsers = selectedInputs
+              .filter((input) => {
+                const userId = parseInt(input.value, 10);
+                const inUsersArray = users.find(u => u.id === userId);
+
+                return !inUsersArray && userId !== 0;
+              })
+              .map((input) => {
+                const userId = parseInt(input.value, 10);
+                const { avatarUrl, avatar_url, id, name, username } = input.dataset;
+                return {
+                  avatar_url: avatarUrl || avatar_url,
+                  id: userId,
+                  name,
+                  username,
+                };
+              });
+
+            users = data.concat(selectedUsers);
+          }
+
           let anyUser;
           let index;
           let j;

app/views/projects/boards/components/sidebar/_assignee.html.haml

@@ -14,7 +14,11 @@
         name: "issue[assignee_ids][]",
         ":value" => "assignee.id",
         "v-if" => "issue.assignees",
-        "v-for" => "assignee in issue.assignees" }
+        "v-for" => "assignee in issue.assignees",
+        ":data-avatar_url" => "assignee.avatar",
+        ":data-name" => "assignee.name",
+        ":data-id" => "assignee.id",
+        ":data-username" => "assignee.username" }
       .dropdown
         %button.dropdown-menu-toggle.js-user-search.js-author-search.js-multiselect.js-save-user-data.js-issue-board-sidebar{ type: "button", ref: "assigneeDropdown", data: { toggle: "dropdown", field_name: "issue[assignee_ids][]", first_user: (current_user.username if current_user), current_user: "true", project_id: @project.id, null_user: "true", multi_select: "true", dropdown: { header: 'Assignee(s)'} },
           ":data-issuable-id" => "issue.id",

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

@@ -29,7 +29,7 @@
 
 .selectbox.hide-collapsed
   - issuable.assignees.each do |assignee|
-    = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil
+    = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil, data: { avatar_url: assignee.avatar_url, name: assignee.name, id: assignee.id, username: assignee.username }
 
   - 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_ids][]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true } }
 

app/views/shared/issuable/form/_metadata_issue_assignee.html.haml

@@ -2,7 +2,7 @@
 .col-sm-10{ class: ("col-lg-8" if has_due_date) }
   .issuable-form-select-holder.selectbox
     - issuable.assignees.each do |assignee|
-      = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil, data: { meta: assignee.name }
+      = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil, data: { meta: assignee.name, avatar_url: assignee.avatar_url, name: assignee.name, id: assignee.id, username: assignee.username }
 
     - if issuable.assignees.length === 0
       = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", 0, id: nil, data: { meta: '' }