Bug 121797 [Viewers] internalRefresh(Object)
AbstractListViewer.internalRefresh(Object) does not wrap calls to setRedraw on its org.eclipse.swt.widgets.List within a try-finally block. There are many methods between the two calls to setRedraw that subclasses could throw Exceptions on which could cause setRedraw(true) not to be called. The most likely is the call to the LabelProvider through AbstractLabelViewer.getLabelProviderText(ILabelProvider, Object)
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractListViewer.java
* Method declared on Viewer.
     */
    protected void inputChanged(Object input, Object oldInput) {
        listMap.clear();
        Object[] children = getSortedChildren(getRoot());
        int size = children.length;
        listRemoveAll();
        String[] labels = new String[size];
        for (int i = 0; i < size; i++) {
            Object el = children[i];
            labels[i] = getLabelProviderText((ILabelProvider) getLabelProvider(),el);
            listMap.add(el);
            mapElement(el, getControl()); 
        }
        listSetItems(labels);
    }
    /* (non-Javadoc)
     * Method declared on StructuredViewer.
     */
    protected void internalRefresh(Object element) {
        Control list = getControl();
        if (element == null || equals(element, getRoot())) {
            
            if (listMap != null) {
				listMap.clear();
			}
            unmapAllElements();
            List selection = getSelectionFromWidget();
            
            int topIndex = -1;