Design mode/Qt Designer clean-up, part III: Resources.

Move resource code to new ResourceHandler class and
instantiate it on the form window.

src/plugins/designer/designerxmleditor.cpp

@@ -29,8 +29,10 @@
 
 #include "designerxmleditor.h"
 #include "designerconstants.h"
+#include "resourcehandler.h"
 #include "qt_private/formwindowbase_p.h"
 
+
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/modemanager.h>
@@ -124,6 +126,9 @@ bool DesignerXmlEditorEditable::open(const QString &fileName)
     setDisplayName(fi.fileName());
     m_file.setFileName(absfileName);
 
+    if (Internal::ResourceHandler *rh = qFindChild<Designer::Internal::ResourceHandler*>(form))
+        rh->updateResources();
+
     emit changed();
 
     return true;