Bug 24521 [Viewers] TreeViewer.update() does not work correctly with filter
When I add an element which does not satisfy the filtering condition and then update it so that it does, call to update does not show the element. This is because[StructuredViewer.update]: public void update(Object element, String[] properties) { Assert.isNotNull(element); | Widget item = findItem(element); | if (item == null) | return; the code silently ignores that the element may become visible... btw. later in code of this method: if (needsRefilter) { refresh(); return; } This is quite inefficient, as it needs to query all visible items; however only one element may actually change (change visibility and/or sort order).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
public ColorAndFontCollectorWithProviders(IBaseLabelProvider provider) {
			super();
			if (provider instanceof IColorProvider) {
				colorProvider = (IColorProvider) provider;
			}
			if (provider instanceof IFontProvider) {
				fontProvider = (IFontProvider) provider;
			}
		}
		
	
		/* (non-Javadoc)
		 * @see org.eclipse.jface.viewers.StructuredViewer.ColorAndFontManager#setFontsAndColors(java.lang.Object)
		 */
		public void setFontsAndColors(Object element){
			
			if(fontProvider != null){
				if(font == null) {
					font = fontProvider.getFont(element);
				}	
			}
			
			if(colorProvider == null) {
				return;
			}			
			
			if(background == null) {
				background = colorProvider.getBackground(element);
			}