Remember collapsed channels in inbox

[gnprice]

In the web app, if you collapse a channel in the Inbox view, it remains collapsed even when you reload the app. This is a useful feature and we should do the same.

This is a post-launch issue, because it's something we don't offer in the legacy zulip-mobile app.

Chat thread: https://chat.zulip.org/#narrow/stream/48-mobile/topic/Keep.20topics.20expand.2Fcollapse.20state/near/1956400

[rohansen856]

hello @gnprice i would like to work on this issue. can you please assign me?

[gnprice]

Please see our guide to "where to look for an issue" and claiming an issue:
https://zulip.readthedocs.io/en/latest/contributing/contributing.html#your-first-codebase-contribution

[chrisbobbe]

This came up in beta feedback today, along with a suggestion to add a "collapse all" button: #mobile > Flutter Android 0.0.30 feedback @ 💬