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
if(usedDecorators){
				
				if(background != null) {
					control.setBackground(background);
				}
			
				if(foreground != null) {
					control.setForeground(foreground);
				}
		
				if(font != null) {
					control.setFont(font);
				}
			}
			clear();
		}
		
		/**
		 * Set the background color.
		 * @param background 
		 */
		public void setBackground(Color background) {
			this.background = background;
		}
		/**
		 * Set the font.
		 * @param font 
		 */
		public void setFont(Font font) {
			this.font = font;