Bug 81078 [preferences] Restore Defaults duplicates list entries
I200412142000 Restore Defaults on Java > Editor > Appearance duplicates the "Appearance color options" entries.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CodeAssistConfigurationBlock.java
label= PreferencesMessages.getString("JavaEditorPreferencePage.completePrefixes"); 
		addCheckBox(composite, label, PreferenceConstants.CODEASSIST_PREFIX_COMPLETION, 0);		
		
		composite= manager.createSection(PreferencesMessages.getString("CodeAssistConfigurationBlock.sortingSection.title")); 
		composite.setLayout(new GridLayout(2, false));
		
		label= PreferencesMessages.getString("JavaEditorPreferencePage.showOnlyProposalsVisibleInTheInvocationContext"); 
		addCheckBox(composite, label, PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS, 0);
		
		label= PreferencesMessages.getString("JavaEditorPreferencePage.presentProposalsInAlphabeticalOrder"); 
		addCheckBox(composite, label, PreferenceConstants.CODEASSIST_ORDER_PROPOSALS, 0);
		
		composite= manager.createSection(PreferencesMessages.getString("CodeAssistConfigurationBlock.advancedSection.title")); 
		composite.setLayout(new GridLayout(2, false));
		
		label= PreferencesMessages.getString("JavaEditorPreferencePage.automaticallyAddImportInsteadOfQualifiedName"); 
		addCheckBox(composite, label, PreferenceConstants.CODEASSIST_ADDIMPORT, 0);
		
		label= PreferencesMessages.getString("JavaEditorPreferencePage.fillArgumentNamesOnMethodCompletion"); 
		Button master= addCheckBox(composite, label, PreferenceConstants.CODEASSIST_FILL_ARGUMENT_NAMES, 0);
		
		label= PreferencesMessages.getString("JavaEditorPreferencePage.guessArgumentNamesOnMethodCompletion"); 
		Button slave= addCheckBox(composite, label, PreferenceConstants.CODEASSIST_GUESS_METHOD_ARGUMENTS, 0);
		createDependency(master, slave);
		
		composite= manager.createSection(PreferencesMessages.getString("CodeAssistConfigurationBlock.autoactivationSection.title")); 
		composite.setLayout(new GridLayout(2, false));
		
		label= PreferencesMessages.getString("JavaEditorPreferencePage.enableAutoActivation"); 
		final Button autoactivation= addCheckBox(composite, label, PreferenceConstants.CODEASSIST_AUTOACTIVATION, 0);