Bug 15604 Promote Fill arguments on method completion to a real preference
It is still in work in progress but it has become an established feature by now. Promote the preference to the code assist preference page.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/JavaCompletionProcessor.java
if (value instanceof String) {
			String newValue= restrict ? ENABLED : DISABLED;
			if ( !newValue.equals((String) value)) {
				options.put(VISIBILITY, newValue);
				JavaCore.setOptions(options);
			}
		}
	}
	
	/**
	 * Tells this processor to order the proposals alphabetically.
	 * 
	 * @param order <code>true</code> if proposals should be ordered.
	 */
	public void orderProposalsAlphabetically(boolean order) {
		fComparator.setOrderAlphabetically(order);
	}
	
	/**
	 * Tells this processor to restrict is proposals to those
	 * starting with matching cases.
	 * 
	 * @param restrict <code>true</code> if proposals should be restricted
	 */
	public void restrictProposalsToMatchingCases(boolean restrict) {
		
	}
	
	/**
	 * Tells this processor to add import statement for proposals that have