Bug 151205 [Viewers] Add setFilters() to change multiple filters at once efficiently
When one needs to add more than one filter after every request a refresh command is issued which is not desired an API-Function where the user could control whether the refresh is called or not would be a great performance improvement.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
protected boolean usingElementMap() {
		return elementMap != null;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ContentViewer#setLabelProvider(org.eclipse.jface.viewers.IBaseLabelProvider)
	 */
	public void setLabelProvider(IBaseLabelProvider labelProvider) {
		if (labelProvider instanceof IColorProvider || labelProvider instanceof IFontProvider) {
			colorAndFontCollector = new ColorAndFontCollectorWithProviders(labelProvider);
		} else {
			colorAndFontCollector = new ColorAndFontCollector();
		}
		super.setLabelProvider(labelProvider);
		
	}
	
	/**
	 * Build a label up for the element using the supplied label provider.
	 * @param updateLabel The ViewerLabel to collect the result in
	 * @param element The element being decorated.
	 */
	protected void buildLabel(ViewerLabel updateLabel, Object element){
		if (getLabelProvider() instanceof IViewerLabelProvider) {
			IViewerLabelProvider itemProvider = (IViewerLabelProvider) getLabelProvider();
			itemProvider.updateLabel(updateLabel, element);
            		
			colorAndFontCollector.setUsedDecorators();
			
			if(updateLabel.hasNewBackground()) {
				colorAndFontCollector.setBackground(updateLabel.getBackground());