feat: disable background scrolling when the modal is open

[raphaelbernhart]

Describe the feature

At least for me on mac the website is still scrollable even if the modal is opened. IMO it is common sense that the website scroll should be blocked when a modal is opened.

FYI - I'm open to create a MR for this but please add some feedback of your thoughts
Sidenote for me: keep iOS in mind when developing this feature.

Additional information

• Would you be willing to help implement this feature?

Final checks

• Check existing discussions and issues.

[dargmuesli]

Good idea, imho. Consider using headlessui/dialog, I'd say 💡

[raphaelbernhart]

Good idea, imho. Consider using headlessui/dialog, I'd say 💡

Do you think headlessui could bloat the module unnecessarily? IMO installing a ui-library should be discussed as the module over all could then probably need a refactor?

Nevertheless I think the scroll-disable feature can also be added without installing a third-party (just FYI).
What do you think?

[raphaelbernhart]

see #228 (comment)