Layout fixes for QQC2

demo/qml/StyleSwitcher2.qml

@@ -0,0 +1,24 @@
+import QtQuick 2.6
+import QtQuick.Controls 2.2
+import QtQuick.Layouts 1.3
+
+RowLayout {
+    Image {
+        sourceSize.height: 2 * box.height
+        fillMode: Image.PreserveAspectFit
+        source: "../logo.svg"
+    }
+    ComboBox {
+        id: box
+        Layout.fillWidth: true
+        currentIndex: qtquickIndex
+        model: styles
+        textRole: "display"
+        onActivated: {
+            if (index !== qtquickIndex) {
+                widgets.currentIndex = index
+                application.close()
+            }
+        }
+    }
+}