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
{
		List tmpErrors = super.checkContent( module, containerInfo, content );
		if ( !tmpErrors.isEmpty( ) )
			return tmpErrors;
		tmpErrors.addAll( ThemeStyleNameValidator.getInstance( )
				.validateForAddingStyle( (ThemeHandle) getHandle( module ),
						content.getFullName( ) ) );
		return tmpErrors;
	}
	/**
	 * Drops the given css from css list.
	 * 
	 * @param css
	 *            the css to drop
	 * @return the position of the css to drop
	 */
	public int dropCss( CssStyleSheet css )
	{
		if( operation == null )
			return -1;
		return operation.dropCss( css );
	}
	/**
	 * Adds the given css to css list.
	 * 
	 * @param css
	 *            the css to insert
	 */
	public void addCss( CssStyleSheet css )
	{