Use a dialog for custom date form instead of including it in the action menu

[marcoambrosini]

Including baby forms within action menus is a recurring pattern in Nextcloud and it's one that I think we should break. We shouldn't include forms, especially if they involve multi-selects and pickers, into tiny action menus.
When there's the need of a form we can add an action button that brings up a dialog or opens the form somewhere else.
Having a text input with an inline submit button is probably ok but still not ideal IMO.

In this particular case we have a baby form with a submit button that looks exactly like an action buttons above, creating visual confusion and usability issues. For example here there's no way to guarantee that the picker itself won't block the button to submit the form itself once you've chosen the date. (see screenshot)

This came up in a recent design call and there was some consensus on that we should probably even deprecate these complex action input elements. What do you think @nextcloud/designers ??

Originally posted by @marcoambrosini in #10105 (comment)

[nickvergessen]

This solution already existed in the mail app with the send later functionality and is planned to keep aligned between:

• Reminder / Send later in Mail - Snooze mails mail#2048 cc @ChristophWurst @JohannesGGE
• Reminder in Files - 📣 Set reminder: file/folder server#39181 cc @Pytal
• Reminder in Talk - 🔔 Notify me later about this message #10075 cc @Antreesy

[marcoambrosini]

I agree we should be consistent, but we should break this pattern and adopt a better one. This is another instance in mail:

--

To provide a counter example. In the files reminders issue, Gmail was used as inspiration, but there clicking "pick date and time" in the action menu brings up a nice and tidy dialog where everything is clearly laid out.

[jancborchardt]

This seems to be an issue for the components library though, not only for Talk?

[marcoambrosini]

The issue in the component library is that we have an actioninput type date.

[marcoambrosini]

@skjnldsv I mean putting the native date picker in a modal with confirmation button, so yes what Joas said above

[skjnldsv]

[marcoambrosini]

Beautiful @skjnldsv :)