Bug 148771 Bottom margin is invalid in PDF & HTML
Details: Bottom margin is invalid Step: 1.New a label. 2.New a data item. 3.New a label again. 4.Set bottom margin as -20 point Actual result: See the attach image
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/area/impl/AbstractArea.java
protected int x;
	/**
	 * y position of this area in parent area
	 */
	protected int y;
	/**
	 * width of this area
	 */
	protected int width;
	/**
	 * height of this area
	 */
	protected int height;
	/**
	 * the content object
	 */
	protected IContent content;
	/**
	 * constructor
	 * 
	 * @param content
	 */
	AbstractArea( IContent content )
	{
		this.content = content;
		if ( content != null )
		{
			style = new AreaStyle( (ComputedStyle) content.getComputedStyle( ) );
		}
		else