Vertical space filling tooltip overflowed

[stargazing-dino]

I don't think this should overflow as I've passed in a scroll Controller and there is technically space both before and after. If anything, this looks weird in where it decides to stop drawing. Are those the constaints?

class TooltipAreaExamplePage extends StatefulWidget {
  const TooltipAreaExamplePage({Key? key}) : super(key: key);

  @override
  State<TooltipAreaExamplePage> createState() => _TooltipAreaExamplePageState();
}

class _TooltipAreaExamplePageState extends State<TooltipAreaExamplePage> {
  final titleController = TextEditingController(
    text: 'Lorem ipsum dolor',
  );
  final descriptionController = TextEditingController(
    text: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do '
        'eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim '
        'ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut ',
  );
  final scrollController = ScrollController();

  @override
  void dispose() {
    titleController.dispose();
    descriptionController.dispose();
    scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('It goes under me')),
      body: JustTheTooltipArea(
        builder: (context, tooltip, scrim) {
          return Stack(
            fit: StackFit.passthrough,
            children: [
              ListView(
                controller: scrollController,
                children: List.generate(
                  40,
                  (index) {
                    if (index == 15) {
                      return JustTheTooltipEntry(
                        scrollController: scrollController,
                        isModal: true,
                        tailLength: 20.0,
                        preferredDirection: AxisDirection.right,
                        margin: const EdgeInsets.all(16.0),
                        child: const Material(
                          color: Colors.blue,
                          shape: CircleBorder(),
                          elevation: 4.0,
                          child: Padding(
                            padding: EdgeInsets.all(8.0),
                            child: Icon(
                              Icons.touch_app,
                              color: Colors.white,
                            ),
                          ),
                        ),
                        content: Column(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            TextField(
                              maxLines: null,
                              keyboardType: TextInputType.text,
                              textCapitalization: TextCapitalization.sentences,
                              style: Theme.of(context).textTheme.headline6,
                              controller: titleController,
                            ),
                            const SizedBox(height: 12.0),
                            TextField(
                              controller: descriptionController,
                              maxLines: null,
                              keyboardType: TextInputType.multiline,
                              textCapitalization: TextCapitalization.sentences,
                              style: Theme.of(context).textTheme.subtitle1,
                            ),
                            const SizedBox(height: 16.0),
                            Row(
                              mainAxisAlignment: MainAxisAlignment.spaceAround,
                              children: [
                                Expanded(
                                  child: OutlinedButton(
                                    style: OutlinedButton.styleFrom(
                                      shape: const StadiumBorder(),
                                    ),
                                    onPressed: () {},
                                    child: const Text('exercises'),
                                  ),
                                ),
                                const SizedBox(width: 16.0),
                                Expanded(
                                  child: OutlinedButton(
                                    style: OutlinedButton.styleFrom(
                                      shape: const StadiumBorder(),
                                    ),
                                    onPressed: () {},
                                    child: const Text('course'),
                                  ),
                                ),
                              ],
                            )
                          ],
                        ),
                      );
                    }

                    return ListTile(title: Text('Item $index'));
                  },
                ),
              ),
              if (scrim != null) scrim,
              if (tooltip != null) tooltip,
            ],
          );
        },
      ),
    );
  }
}