Remember the state of comments when navigating out and back in

[micahmo]

Is your feature request related to a problem? Please describe.
Currently, every time we navigate into a comment section, it is reloaded fresh.

Describe the solution you'd like
It would be nice if we could remember the state of the comments for a given post so that we can navigate out and back in without losing our spot. This would facilitate the following workflow (as an example).

• I'm reading through the comments
• I want to see the post's title/image as a reminder, so I navigate out to the main feed
• I navigate back into the comments and want to pick up where I left off

Note that to avoid things getting stale, we can do this for only the most recently visited post. If I go to the comments for post A, then B, then A again, it's ok to reload.

For those familiar with Relay, this is how things worked there.

[Glazed]

It's probably less work to provide some UI to let you peek at the post from anywhere in the comments. However, you're feature is better if you tap the Back button by accident.

[micahmo]

It's probably less work

Fortunately, the work to implement this feature has already been done! 😆 See #1520.

And yeah, like you said, there are any number of reasons to have this beyond just wanting to get a peek at the post again. Maybe you go back by accident, maybe you go back intentionally but then change your mind. It's just a nice QoL feature to have, and the Reddit client I came from (Relay) had it, so it's just one of those little things I miss on a daily basis. 😊