Bug 130495 Get rid of SessionHandleAdapter
Now, we use SessionHandleAdapter to keep current active report deisng. That's a bad practive for editor swith and rebuild will cuase lots of problmes. Need find way to replace it.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
* 
	 * @see org.eclipse.ui.forms.editor.FormEditor#editorDirtyStateChanged()
	 */
	public void editorDirtyStateChanged( )
	{
		super.editorDirtyStateChanged( );
		markPageStale( );
	}
	private void markPageStale( )
	{
		
		IFormPage currentPage = getActivePageInstance( );
		if ( !( currentPage instanceof IReportEditorPage ) )
		{
			return;
		}