feat(calendar): allow to select meeting attendees

[Antreesy]

☑️ Resolves

• Follow-up

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[DorraJaouad]

Checking that current user is a moderator makes it safer to use in the future.

[Antreesy]

Shouldn't be a task of this component IMO, but I'll put it on board

[nickvergessen]

Merging for today

[nimishavijay]

Awesome! Great that we will be able to add attendees! Some points for feedback:

• Distinguish the entire section by adding a heading "Attendees"
• Instead of a toggle, use a checkmark. Toggles are usually used for more "technical" settings IMO
• "Select attendees" button can be tertiary and add a person-add icon
• "Select attendees" button and summary can be in different rows to prevent the button position shifting slightly when the number changes
• Wording adjustments:
  • It took a second for me to understand Invite all users and email guests --> Invite all participants in the conversation and email guests
  • Select attendees --> Add attendees
  • Sending 14 invitations --> [👩 Alice Doe], [👨 Sam Smith] and 12 more guests will receive invites (ideal) or 14 guests will receive invites
  • For errors, don't prefix with "Error: ", we can just say what's wrong like "Invalid start time set" :)

Regarding the attendees modal, 3 points for feedback:

• Select attendees --> Add attendees
• If possible, show the selected attendees up top like when you create a new group conversation in Talk (in fact, the whole modal can just be replicated)
• Add a ✔️ Done or ✔️ Save button at the end to prevent confusion about whether or not the attendees are added
  

Super cool work! :)

[nickvergessen]

It took a second for me to understand Invite all users and email guests --> Invite all participants in the conversation and email guests

Well but it does not invite all participants… federated users don't work, normal guests don't work, …