Tiled rendering: The tile shows now when we request for it.

But so far it is just a white rectangle ;-) - next step is to check if it is
something real.

Change-Id: I06c5ffe0479970d0ca7531a0d037312dc195865f

sw/qa/tiledrendering/tiledrendering.cxx

@@ -133,6 +133,9 @@ IMPL_LINK ( TiledRenderingDialog,  RenderHdl, Button *, EMPTYARG )
         // copy the aDevice content to mpImage
         BitmapEx aBitmap(aDevice.GetBitmapEx(Point(0,0), aDevice.GetOutputSizePixel()));
         mpImage->SetImage(Image(aBitmap));
+
+        // update the dialog size
+        setOptimalLayoutSize();
     }
 
     return 1;

sw/qa/tiledrendering/tiledrendering.ui

@@ -15,11 +15,11 @@
   </object>
   <object class="GtkWindow" id="TiledRendering">
     <property name="can_focus">False</property>
+    <property name="border_width">12</property>
     <child>
       <object class="GtkBox" id="box1">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="border_width">12</property>
         <property name="spacing">12</property>
         <child>
           <object class="GtkBox" id="box7">