Bug 19889 [assist] completion in throws clause or in javadoc @throws tag should propose only exception class
When I'm here: /** {@link Unsupp and ask for autocompletion, it comes up with a window listing a few types, among them java.lang.UnsupportedOperationException. When I'm here: /** @throws Unsupp or here: /** @exception Unsupp autocompletion has no idea what could possibly follow.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/javadoc/JavaDocCompletionEvaluator.java
buf.append(Signature.toString(types[i]));
				if (i != last) {
					buf.append(", "); 
				}
			}
			buf.append(')');
			return buf.toString();
		} else {
			return elem.getElementName();
		}
	}	
	
	/**
	 * Returns true if case is handeled
	 */
	private boolean addArgumentProposals(String tag, String argument) throws JavaModelException {	
		IJavaElement elem= fCompilationUnit.getElementAt(fCurrentPos);
		if ("@see".equals(tag) || "@link".equals(tag)) { 
			if (elem instanceof IMember) {
				evalSeeTag((IMember) elem, argument);
				return true;
			}
		} else if ("@param".equals(tag)) { 
			if (elem instanceof IMethod) {
				String[] names= ((IMethod)elem).getParameterNames();
				addProposals(argument, names, JavaPluginImages.IMG_MISC_DEFAULT);
			}
			return true;
		} else if ("@throws".equals(tag) || "@exception".equals(tag)) { 
			if (elem instanceof IMethod) {