Invites badge behavior

[alfogrillo]

As a user I want to see a badge in the all chats just when new invites arrives.

Designs

• All chats

Matrix APIs
No new APIs are required for this task. There's an is_invite filter on sliding sync.

ACs

• The invites's badge shows just when new invitations arrive
• New invitations have a green badge in the invites list
• Opening the invite list hides the badge
• The badge shows again when the sliding sync delivers a new fresh invite
• The badge doesn't sync on multiple sessions of the same device.

Tech details
The implementation may require a persisted piece of storage where the "last seen invites" are stored.

• When opening the invites list we render the badges using the set S of the "last seen invites"
• S will be updated just when the user sees a new set of invites in the invites list.
• S should be a set of room IDs (aka strings)

Tasks

Preview Give feedback

We're having trouble rendering your tasklist, it's most likely has one of the following formatting errors:

• indented tasks (i.e. nested tasklist; support for this is coming!)
• an empty task (i.e. - [ ] on a line by itself)
• any empty new lines (before/after the tasklist or in between tasks)
• duplicate issue/pr links
• a draft task exceeds 512 characters

Please check the tasklists documentation for more information. 🔗 Feedback Discussion

Thank you for participating in the Private Beta ❤️

1. Invites badge behavior vector-im/element-x-android#238
   T-Enhancement Team: Element X Feature +2
   
2. Invites badge behavior element-x-ios#714
   T-Enhancement Team: Element X Feature +2