Wizards: Delay parsing of custom wizards.

... by introducing signal ICore::showNewItemsDialog().

Reviewed-by: Kai Köhne <kai.koehne@nokia.com>

src/plugins/coreplugin/mainwindow.cpp

@@ -885,6 +885,7 @@ QStringList MainWindow::showNewItemDialog(const QString &title,
                                           const QList<IWizard *> &wizards,
                                           const QString &defaultLocation)
 {
+    emit m_coreImpl->newItemsDialogRequested();
     // Scan for wizards matching the filter and pick one. Don't show
     // dialog if there is only one.
     IWizard *wizard = 0;