Bug 156632 [Acceptance]Cannot paste theme when select Themes in Outline.
Description: Cannot paste theme when select Themes in Outline. Steps to reproduce: 1. New a library. 2. Select defaulttheme in outline and cut it 3. Select Themes and right click to paste the theme back. Expected result: Paste in context menu can be used. Actual result: Paste is gray
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
import org.eclipse.birt.report.designer.core.commands.PasteStructureCommand;
import org.eclipse.birt.report.designer.core.model.SessionHandleAdapter;
import org.eclipse.birt.report.designer.core.model.schematic.CellHandleAdapter;
import org.eclipse.birt.report.designer.core.model.schematic.ColumnHandleAdapter;
import org.eclipse.birt.report.designer.core.model.schematic.HandleAdapterFactory;
import org.eclipse.birt.report.designer.core.model.schematic.ListBandProxy;
import org.eclipse.birt.report.designer.core.model.views.data.DataSetItemModel;
import org.eclipse.birt.report.designer.core.model.views.outline.EmbeddedImageNode;
import org.eclipse.birt.report.designer.core.model.views.outline.ReportElementModel;
import org.eclipse.birt.report.designer.nls.Messages;
import org.eclipse.birt.report.model.api.CascadingParameterGroupHandle;
import org.eclipse.birt.report.model.api.CellHandle;
import org.eclipse.birt.report.model.api.ColumnBandData;
import org.eclipse.birt.report.model.api.ColumnHandle;
import org.eclipse.birt.report.model.api.CommandStack;
import org.eclipse.birt.report.model.api.DataSetHandle;
import org.eclipse.birt.report.model.api.DataSourceHandle;
import org.eclipse.birt.report.model.api.DesignElementHandle;
import org.eclipse.birt.report.model.api.EmbeddedImageHandle;
import org.eclipse.birt.report.model.api.GridHandle;
import org.eclipse.birt.report.model.api.GroupHandle;
import org.eclipse.birt.report.model.api.LibraryHandle;
import org.eclipse.birt.report.model.api.ListGroupHandle;
import org.eclipse.birt.report.model.api.ListHandle;
import org.eclipse.birt.report.model.api.ModuleHandle;
import org.eclipse.birt.report.model.api.ParameterGroupHandle;
import org.eclipse.birt.report.model.api.ReportDesignHandle;
import org.eclipse.birt.report.model.api.ReportItemHandle;
import org.eclipse.birt.report.model.api.ResultSetColumnHandle;
import org.eclipse.birt.report.model.api.ScalarParameterHandle;