Bug 131692 [Contributions] ContributionManager.insertAfter throws unhelpful IllegalArgumentException
look at insertBefore and you see this line throw new IllegalArgumentException("can't find ID " + ID);//$NON-NLS-1$ but in insertAfter it looks like this throw new IllegalArgumentException("can't find ID");//$NON-NLS-1$ NOTE: in the second example it doesn't tell you what the ID is. My "patch" is to make insertAfter behave like insertBefore
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ContributionManager.java
addToGroup(groupName, new ActionContributionItem(action), false);
    }
    /* (non-Javadoc)
     * Method declared on IContributionManager.
     */
    public void prependToGroup(String groupName, IContributionItem item) {
        addToGroup(groupName, item, false);
    }
    /* (non-Javadoc)
     * Method declared on IContributionManager.
     */
    public IContributionItem remove(String ID) {
        IContributionItem ci = find(ID);
        if (ci == null) {
			return null;
		}
        return remove(ci);
    }
    /* (non-Javadoc)
     * Method declared on IContributionManager.
     */
    public IContributionItem remove(IContributionItem item) {
        if (contributions.remove(item)) {
            itemRemoved(item);
            return item;
        }
        return null;
    }
    /* (non-Javadoc)
     * Method declared on IContributionManager.