Bug 18266 Turning off lightbulb preference doesn't turn the lights off right away
When you turn off the lightbulb preference, editors with existing lightbulbs continue to show them. Closing and reopening the editors gets rid of them.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
e= fTextFields.keySet().iterator();
		while (e.hasNext()) {
			Text t= (Text) e.next();
			String key= (String) fTextFields.get(t);
			t.setText(fOverlayStore.getString(key));
		}
		
		RGB rgb= PreferenceConverter.getColor(fOverlayStore, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND);
		fBackgroundColorEditor.setColorValue(rgb);		
		
		boolean default_= fOverlayStore.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT);
		fBackgroundDefaultRadioButton.setSelection(default_);
		fBackgroundCustomRadioButton.setSelection(!default_);
		fBackgroundColorButton.setEnabled(!default_);
		
        updateAutoactivationControls();
	}
    private void updateAutoactivationControls() {
        boolean autoactivation= fOverlayStore.getBoolean(ContentAssistPreference.AUTOACTIVATION);
        fAutoInsertDelayText.setEnabled(autoactivation);
        fAutoInsertJavaTriggerText.setEnabled(autoactivation);
        fAutoInsertJavaDocTriggerText.setEnabled(autoactivation);
    }
	
	/*
	 * @see PreferencePage#performOk()
	 */
	public boolean performOk() {
		fFontEditor.store();