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
* Marks the manager as dirty and updates the number of dynamic items, and the memento.
     */
    protected void itemAdded(IContributionItem item) {
        item.setParent(this);
        markDirty();
        if (item.isDynamic()) {
			dynamicItems++;
		}
    }
    /**
     * The given item was removed from the list of contributions.
     * Marks the manager as dirty and updates the number of dynamic items.
     */
    protected void itemRemoved(IContributionItem item) {
        item.setParent(null);
        markDirty();
        if (item.isDynamic()) {
			dynamicItems--;
		}
    }
    /* (non-Javadoc)
     * Method declared on IContributionManager.
     */
    public void markDirty() {
        setDirty(true);
    }
    /* (non-Javadoc)
     * Method declared on IContributionManager.
     */
    public void prependToGroup(String groupName, IAction action) {