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
addCheckBox(composite, label, CompilationUnitEditor.SKIP_CLOSING_BRACKETS, 1);
		label= JavaUIMessages.getString("JavaEditorPreferencePage.closeJavaDocs"); 
		final Button button= addCheckBox(composite, label, CompilationUnitEditor.CLOSE_JAVADOCS, 1);
		label= JavaUIMessages.getString("JavaEditorPreferencePage.addJavaDocTags"); 
		fAddJavaDocTagsButton= addCheckBox(composite, label, CompilationUnitEditor.ADD_JAVADOC_TAGS, 1);
		
		GridData gridData= new GridData();
		gridData.horizontalIndent= 20;
		fAddJavaDocTagsButton.setLayoutData(gridData);
		final Button button2= fAddJavaDocTagsButton;
		button.addSelectionListener(new SelectionListener() {
			public void widgetSelected(SelectionEvent e) {
				button2.setEnabled(button.getSelection());
			}
			public void widgetDefaultSelected(SelectionEvent e) {}
		});
		
		return composite;
	}
	private Control createContentAssistPage(Composite parent) {
		Composite contentAssistComposite= new Composite(parent, SWT.NULL);
		GridLayout layout= new GridLayout(); layout.numColumns= 2;
		contentAssistComposite.setLayout(layout);
		String label= JavaUIMessages.getString("JavaEditorPreferencePage.insertSingleProposalsAutomatically"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.AUTOINSERT, 0);		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.showOnlyProposalsVisibleInTheInvocationContext"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.SHOW_VISIBLE_PROPOSALS, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.presentProposalsInAlphabeticalOrder"); 
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.ORDER_PROPOSALS, 0);