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
import org.eclipse.ui.texteditor.WorkbenchChainedTextFontFieldEditor;
import org.eclipse.jdt.ui.text.IJavaColorConstants;
import org.eclipse.jdt.ui.text.JavaSourceViewerConfiguration;
import org.eclipse.jdt.ui.text.JavaTextTools;
import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.JavaUIMessages;
import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
import org.eclipse.jdt.internal.ui.dialogs.StatusUtil;
import org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider;
import org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor;
import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
import org.eclipse.jdt.internal.ui.text.ContentAssistPreference;
import org.eclipse.jdt.internal.ui.util.TabFolderLayout;
/*
 * The page for setting the editor options.
 */
public class JavaEditorPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {
	
	public static final String BOLD= "_bold"; 
	public static final String PREF_SHOW_TEMP_PROBLEMS= "JavaEditor.ShowTemporaryProblem"; 
	public static final String PREF_SYNC_OUTLINE_ON_CURSOR_MOVE= "JavaEditor.SyncOutlineOnCursorMove"; 
	public final OverlayPreferenceStore.OverlayKey[] fKeys= new OverlayPreferenceStore.OverlayKey[] {
		
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND_SYSTEM_DEFAULT),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.INT, JavaSourceViewerConfiguration.PREFERENCE_TAB_WIDTH),