Bug 188829 Move the item ,the trans of the model don't close.
1:New report design. 2:Add a Embedded image. 3:Add another imge , then drag the second imge to the first position. 4:Change the size of the first image. Expected: Image change the size. Now: Image size don't change.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/command/ContentCommandTest.java
assertEquals( content, obj );
		assertEquals( style, content.getStyle( ) );
		assertNotNull( content.getExtendsElement( ) );
		containerHandle.getSlot( 0 ).dropAndClear( 0 );
		assertTrue( container.getSlot( 0 ).getCount( ) == 0 );
		
		assertNull( content.getStyle( ) );
		assertNull( content.getExtendsElement( ) );
		
		assertEquals( 0, style.getClientList( ).size( ) );
		assertEquals( 0, parent.getSlot( 0 ).getCount( ) );
		assertEquals( 0, parent.getDerived( ).size( ) );
		
		assertFalse( as.canRedo( ) );
		assertTrue( as.canUndo( ) );
		as.undo( );
		assertTrue( container.getSlot( 0 ).getCount( ) == 1 );
		
		assertEquals( style, content.getStyle( ) );
		assertEquals( content,
				( (BackRef) style.getClientList( ).get( 0 ) ).element );
		
		assertEquals( parent, content.getExtendsElement( ) );
		assertEquals( content, parent.getDescendents( ).get( 0 ) );
		
		assertTrue( as.canRedo( ) );
		assertTrue( as.canUndo( ) );
		as.undo( );
		assertTrue( container.getSlot( 0 ).getCount( ) == 0 );