Bug 186940 Style name in theme cannot be identify by auto when reopen the library[01]
Description: Style name in theme cannot be identify by auto when reopen the library[01] Step: 1.Open a library and add a theme 2.New a style on the theme and use the default name that is "NewStyle" 3.Save the library, close it and reopen it again. 4.New another style on the same theme Actual result: The default style name on second times is also "NewStyle" Exception result: The default style name on second times is "NewStyle1"
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/elements/Theme.java
* Returns the style with the given name.
	 * 
	 * @param styleName
	 *            the style name
	 * @return the corresponding style
	 */
	public StyleElement findStyle( String styleName )
	{
		if ( styleName == null )
			return null;
		List styles = getAllStyles( );
		for ( int i = 0; i < styles.size( ); ++i )
		{
			StyleElement style = (StyleElement) styles.get( i );
			if ( styleName.equals( style.getFullName( ) ) )
			{
				return style;
			}
		}
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#checkContent(org.eclipse.birt.report.model.core.Module,
	 *      org.eclipse.birt.report.model.core.ContainerInfo,
	 *      org.eclipse.birt.report.model.core.DesignElement)
	 */
	public List checkContent( Module module, ContainerContext containerInfo,
			DesignElement content )