New surface: sidebar

[Falci]

Description

I'd like to suggest the creation of a new surface: sidebar.

What type of issue is this? (place an x in one of the [ ])

• [ ] bug
• [x] enhancement (feature request)
• [ ] question
• [ ] documentation related
• [ ] testing related
• [ ] discussion

Requirements (place an x in each of the [ ])

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've searched for any related issues and avoided creating a duplicate issue.

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Idea

The idea is to be able to customize the sidebar of a specific channel. Example of usage:

• Each product on my company has a channel, in the sidebar we'd like to display info like changelog, latested version.
• Each POD has a channel: we'd like to display relevant info about each POD: logo, roles, projects we are in
• An app related to gamification could use the sidebar to show the ranking.
• An app for poll could show the history and open polls.
• A Github app could display open PR/issues

The sidebar could request new content every time it's opened. The app could also push new content (like the incoming webhook). It could also display buttons/actions

Please, let me know what do you think,

[sanielfishawy]

Yes this would be very useful for an in channel app.

The modal is too intrusive and blocking as a surface. The message is too transient as a surface.

What is needed is a non transient sidebar surface that an app can use that might be shared among the participants of a conversation as a share document is.