[26338] Allow spaces in matcher for principal mentions (#5930)

* [26338] Allow spaces in matcher for principal mentions

* Bump atwho.js to 1.5.4 and use option 'acceptSpaceBar'

[ci skip]

frontend/app/components/common/autocomplete/auto-complete-helper.service.ts

@@ -41,6 +41,7 @@ export class AutoCompleteHelperService {
       limit: 10,
       highlightFirst: true,
       suffix: '',
+      acceptSpaceBar: true,
       textarea: textarea,
       callbacks: {
         remoteFilter: (query:string, callback:Function) => {

spec/features/work_packages/details/inplace_editor/shared_examples.rb

@@ -125,11 +125,14 @@ end
 
 shared_examples 'a principal autocomplete field' do
   let!(:user) { FactoryGirl.create :user, member_in_project: project, firstname: 'John' }
-  let!(:mentioned_user) { FactoryGirl.create :user, member_in_project: project, firstname: 'Laura' }
+  let!(:mentioned_user) { FactoryGirl.create :user, member_in_project: project, firstname: 'Laura', lastname: 'Foobar' }
 
   it 'autocompletes links to user profiles' do
     field.activate!
     field.input_element.send_keys(" @lau")
     expect(page).to have_selector('.atwho-view-ul li.cur', text: mentioned_user.name)
+
+    field.input_element.send_keys(" @Laura Fo")
+    expect(page).to have_selector('.atwho-view-ul li.cur', text: mentioned_user.name)
   end
 end