Bug 115711 [content assist] Parameter hints disappear immediately
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/ParameterGuessingProposal.java
if (proposal instanceof JavaCompletionProposal) 
				((JavaCompletionProposal) proposal).setReplacementOffset(replacementOffset + buffer.length());
			buffer.append(argument);
		}
		
		if (prefs.beforeClosingParen)
			buffer.append(SPACE);
		buffer.append(RPAREN);
		return buffer.toString();
	}
	
	/**
	 * Returns the currently active java editor, or <code>null</code> if it
	 * cannot be determined.
	 *
	 * @return  the currently active java editor, or <code>null</code>
	 */
	private JavaEditor getJavaEditor() {
		IEditorPart part= JavaPlugin.getActivePage().getActiveEditor();
		if (part instanceof JavaEditor)
			return (JavaEditor) part;
		else
			return null;
	}
	private ICompletionProposal[][] guessParameters() throws JavaModelException {