Register some more windows

So they get an entry in the Window menu, and window related shortcuts
are registered correctly.

Change-Id: Ie7e882a009f928f1268fdd312e7fb5362f6a837f
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/languageclient/languageclientmanager.cpp

@@ -453,6 +453,7 @@ void LanguageClientManager::showInspector()
         clientName = client->name();
     QWidget *inspectorWidget = instance()->m_inspector.createWidget(clientName);
     inspectorWidget->setAttribute(Qt::WA_DeleteOnClose);
+    Core::ICore::registerWindow(inspectorWidget, Core::Context("LanguageClient.Inspector"));
     inspectorWidget->show();
 }