rework Init/Main ui-previewer post early language detect

i.e. due to d07e7d69
"wait until we know the UI language before initializing gtk"
we need to have uno working earlier

Change-Id: I77dbea78113c1c95b622a2367472a0111d0d32d1

vcl/source/uipreviewer/previewer.cxx

@@ -23,11 +23,28 @@
 class UIPreviewApp : public Application
 {
 public:
+    virtual void Init();
     virtual int Main();
 };
 
 using namespace com::sun::star;
 
+void UIPreviewApp::Init()
+{
+    uno::Reference<uno::XComponentContext> xContext =
+        cppu::defaultBootstrap_InitialComponentContext();
+    uno::Reference<lang::XMultiComponentFactory> xFactory =
+        xContext->getServiceManager();
+    uno::Reference<lang::XMultiServiceFactory> xSFactory =
+        uno::Reference<lang::XMultiServiceFactory> (xFactory, uno::UNO_QUERY_THROW);
+    comphelper::setProcessServiceFactory(xSFactory);
+
+    // Create UCB (for backwards compatibility, in case some code still uses
+    // plain createInstance w/o args directly to obtain an instance):
+    ::ucb::UniversalContentBroker::create(
+        comphelper::getProcessComponentContext() );
+}
+
 int UIPreviewApp::Main()
 {
     std::vector<OUString> uifiles;
@@ -44,19 +61,6 @@ int UIPreviewApp::Main()
         return EXIT_FAILURE;
     }
 
-    uno::Reference<uno::XComponentContext> xContext =
-        cppu::defaultBootstrap_InitialComponentContext();
-    uno::Reference<lang::XMultiComponentFactory> xFactory =
-        xContext->getServiceManager();
-    uno::Reference<lang::XMultiServiceFactory> xSFactory =
-        uno::Reference<lang::XMultiServiceFactory> (xFactory, uno::UNO_QUERY_THROW);
-    comphelper::setProcessServiceFactory(xSFactory);
-
-    // Create UCB (for backwards compatibility, in case some code still uses
-    // plain createInstance w/o args directly to obtain an instance):
-    ::ucb::UniversalContentBroker::create(
-        comphelper::getProcessComponentContext() );
-
     // turn on tooltips
     Help::EnableQuickHelp();