[SuperTextField][iOS] - Selection highlight doesn't appear

[matthew-carroll]

When using a SuperIOSTextField (not a SuperTextField), the selection highlight doesn't appear.

Oddly, when using a SuperTextField on iOS, the selection highlight does appear.

return DecoratedBox(
      decoration: BoxDecoration(
        border: Border.all(color: Colors.grey),
        borderRadius: BorderRadius.circular(4),
        // color: const Color(0xFF222222),
      ),
      child: SuperIOSTextField(
        padding: const EdgeInsets.all(12),
        caretStyle: CaretStyle(color: Colors.red),
        selectionColor: defaultSelectionColor,
        handlesColor: Colors.red,
        textStyleBuilder: (attributions) {
          return defaultTextFieldStyleBuilder(attributions).copyWith(
            color: Colors.white,
            fontSize: 18,
          );
        },
        hintBehavior: HintBehavior.displayHintUntilTextEntered,
        hintBuilder: (_) {
          return Text(
            "Enter text and open toolbar",
            style: TextStyle(
              color: Colors.grey,
              fontSize: 18,
            ),
          );
        },
        popoverToolbarBuilder: iOSSystemPopoverTextFieldToolbarWithFallback,
      ),
    );