Bug 147676 [regression]Visibility set in the first col will affect the second col
Description: Visibility set in the first col will affect the second col Steps to reproduce: 1. Insert a grid(3*3), insert contents to each cell. 2.Set the first col to hide all in visibility and preview Expected result: Only the first col is hidden. Actual result: The second col is hidden, too. If you set the second col in step2, the third col will disappear.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLAbstractLM.java
return pageSetup.getMasterPage( 0 );
		}
		return null;
	}
	/**
	 * if the content is hidden
	 * 
	 * @return
	 */
	private boolean isHidden( IContent content )
	{
		assert content != null;
		IStyle style = content.getStyle( );
		String formats = style.getVisibleFormat( );
		if ( formats != null
				&& ( formats.indexOf( EngineIRConstants.FORMAT_TYPE_VIEWER ) >= 0 || formats
						.indexOf( BIRTConstants.BIRT_ALL_VALUE ) >= 0 ) )
		{
			return true;
		}
		return false;
	}
	protected boolean handleVisibility( )
	{
		assert content != null;
		assert executor != null;
		if ( isHidden( content ) )
		{
			traverse( executor );
			return true;