Font.loadFont() two or more times with the same font family fails on iOS

[gailasgteach]

Example project created with https://start.gluon.io/, adding only FXML, no glisten, just add a button with a single FontIcon. Example project can be accessed here: https://asgteach.com/wp-content/uploads/2022/03/myapp.zip
Works with regular JVM (gluonfx:run), as well as native Graal build on Mac OS X desktop. On iOS, the icons don't render.

Gluon has suggested the following to avoid loading the font multiple times:
[from]
https://github.com/kordamp/ikonli/blob/master/core/ikonli-javafx/src/main/java/org/kordamp/ikonli/javafx/IkonResolver.java#L42
[to]

[+]() private static final Map<String, Font> fontMap = new HashMap<>();
    static {
        INSTANCE = new IkonResolver();
        ServiceLoader<IkonHandler> loader = resolveServiceLoader();
        for (IkonHandler handler : loader) {
            HANDLERS.add(handler);
-            handler.setFont(Font.loadFont(handler.getFontResource().toExternalForm(), 16));
+           String fontStr = handler.getFontResource().toExternalForm();
+           handler.setFont(fontMap.computeIfAbsent(fontStr, key -> Font.loadFont(key, 16)));
        }
    }