Fix adding "Create New..." menu to toolbar

Summary:
Access the object by its existing name rather than renaming it.

BUG: 405780
FIXED-IN: 19.04.1

Test Plan:
- Add {nav Create New} item to toolbar; it now works
- Verify that {nav Create New} menu and toolbar items are disabled when in the trash
- All tests still pass

Reviewers: elvisangelaccio, broulik, #dolphin, cfeck

Reviewed By: cfeck

Subscribers: cfeck, kfm-devel

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D20664

src/dolphinmainwindow.cpp

@@ -1103,7 +1103,6 @@ void DolphinMainWindow::setupActions()
 {
     // setup 'File' menu
     m_newFileMenu = new DolphinNewFileMenu(actionCollection(), this);
-    m_newFileMenu->setObjectName("newFileMenu");
     QMenu* menu = m_newFileMenu->menu();
     menu->setTitle(i18nc("@title:menu Create new folder, file, link, etc.", "Create New"));
     menu->setIcon(QIcon::fromTheme(QStringLiteral("document-new")));

src/tests/dolphinmainwindowtest.cpp

@@ -243,7 +243,7 @@ void DolphinMainWindowTest::testNewFileMenuEnabled()
     QVERIFY(QTest::qWaitForWindowExposed(m_mainWindow.data()));
     QVERIFY(m_mainWindow->isVisible());
 
-    auto newFileMenu = m_mainWindow->findChild<DolphinNewFileMenu*>("newFileMenu");
+    auto newFileMenu = m_mainWindow->findChild<DolphinNewFileMenu*>("new_menu");
     QVERIFY(newFileMenu);
 
     QFETCH(bool, expectedEnabled);