Bug 23459 add preference option to turn off variable guessing on method completion
request from Adam
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
private Map fTextFields= new HashMap();
	private ModifyListener fTextFieldListener= new ModifyListener() {
		public void modifyText(ModifyEvent e) {
			Text text= (Text) e.widget;
			fOverlayStore.setValue((String) fTextFields.get(text), text.getText());
		}
	};
	private ArrayList fNumberFields= new ArrayList();
	private ModifyListener fNumberFieldListener= new ModifyListener() {
		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 Button fAddJavaDocTagsButton;
	private SourceViewer fPreviewViewer;
	private Color fBackgroundColor;
    private Control fAutoInsertDelayText;
    private Control fAutoInsertJavaTriggerText;