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/preferences/JavaEditorPreferencePage.java
public void modifyText(ModifyEvent e) {
			numberFieldChanged((Text) e.widget);
		}
	};
	
	private WorkbenchChainedTextFontFieldEditor fFontEditor;
	private List fSyntaxColorList;
	private List fAppearanceColorList;
	private ColorEditor fSyntaxForegroundColorEditor;
	private ColorEditor fAppearanceForegroundColorEditor;
	private ColorEditor fBackgroundColorEditor;
	private Button fBackgroundDefaultRadioButton;
	private Button fBackgroundCustomRadioButton;
	private Button fBackgroundColorButton;
	private Button fBoldCheckBox;
	private SourceViewer fPreviewViewer;
	private Color fBackgroundColor;
	
	public JavaEditorPreferencePage() {
		setDescription(JavaUIMessages.getString("JavaEditorPreferencePage.description")); 
		setPreferenceStore(JavaPlugin.getDefault().getPreferenceStore());
		fOverlayStore= new OverlayPreferenceStore(getPreferenceStore(), fKeys);
	}
	
	public static void initDefaults(IPreferenceStore store) {
		
		/* 
		 * Ensure that the display is accessed only in the UI thread.
		 * Ensure that there are no side effects of switching the thread.
		 */