Bug 206489 [Markers] Tasks column too small in the new markers view
Tasks column too small in the new markers view. We need to take into account the twistie.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/ExtendedMarkersView.java
* @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
			 *      java.lang.Object, java.lang.Object)
			 */
			public void inputChanged(Viewer viewer, Object oldInput,
					Object newInput) {
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.ILazyTreeContentProvider#updateChildCount(java.lang.Object,
			 *      int)
			 */
			public void updateChildCount(Object element, int currentChildCount) {
				MarkerItem[] children;
				if (element instanceof MarkerItem) {
					MarkerItem item = (MarkerItem) element;
					children = item.getChildren();
				} else {
					
					CachedMarkerBuilder builder = (CachedMarkerBuilder) element;
					children = builder.getElements();
				}
				int newLength = MarkerSupportInternalUtilities.getMarkerLimit();
				if (newLength > 0)
					newLength = Math.min(children.length, newLength);
				else
					newLength = children.length;
				
				if (newLength == currentChildCount)
					return;