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/src/org/eclipse/birt/report/model/command/AbstractContentCommand.java
doMovePosition( content, newPosn );
	}
	/**
	 * Validates the context before moving an element.
	 * 
	 * @param content
	 *            the element to move
	 * @param newPosn
	 *            the new position
	 * @throws ContentException
	 *             if <code>content</code> cannot resides in the new position
	 * 
	 */
	protected void checkBeforeMovePosition( DesignElement content, int newPosn )
			throws ContentException
	{
		assert content != null;
		
		if ( !element.getDefn( ).isContainer( ) )
			throw ContentExceptionFactory.createContentException( focus,
					ContentException.DESIGN_EXCEPTION_NOT_CONTAINER );
		IContainerDefn defn = focus.getContainerDefn( );
		if ( defn == null )
			throw ContentExceptionFactory.createContentException( focus,
					ContentException.DESIGN_EXCEPTION_SLOT_NOT_FOUND );
		if ( !content.isContentOf( element ) )
			throw ContentExceptionFactory.createContentException( focus,
					content,
					ContentException.DESIGN_EXCEPTION_CONTENT_NOT_FOUND );
	}