How to persist inspection options when working with custom options panel?

Hi!

I am implementing a JavaScript inspection that would recognize some placeholder keywords in JS doc comments.

I have a pre-defined set of keywords but I also want to add an option to the inspection's Options panel, so that users can customize the keywords.

So far I have the following class (removed all non-UI related code):

public class MissingPropTypesDocCommentsInspection extends LocalInspectionTool {

    private static final List<String> DEFAULT_KEYWORDS = List.of("asd", "asdasd", "todo", ".");

    @SuppressWarnings("PublicField")
    public OrderedSet<String> placeholderKeywords = new OrderedSet<>(DEFAULT_KEYWORDS);

    @Nullable
    @Override
    public JComponent createOptionsPanel() {
        PlaceholderKeywordsForm form = new PlaceholderKeywordsForm();
        form.placeholderKeywordsField.setText(String.join(",", placeholderKeywords));
        return form.panel;
    }

    /**
     * A form built with Swing UI Designer.
     */
    public static final class PlaceholderKeywordsForm {
        private JTextField placeholderKeywordsField;
        private JPanel panel;
    }
}

So, I built a simple form with the UI Designer, with a label and a textfield in it, and this form is bound to the PlaceholderKeywordsForm class.

What I'm having trouble with finding out are

• when the text in the textfield on my panel changes, how can that change be recognized as a modification by the IJ Settings form? At the moment, if I change anything in it, the Apply button stays inactive.
• how can I persist the state of the fields in my inspection class (placeholderKeywords in this case), so that later when I open Settings, the saved values are loaded, not the default ones I set initially?

Of course with the built-in panel creation utility classes and methods there are no such problems, and I guess under the hood they somehow register the given fields for persistence. But how can this be achieved with such custom-built panels?

Thank you!