msglist: In single-conversation view, make recipient headers not tappable

[chrisbobbe]

Copying from CZO, where Greg said:

@_Anders Kaseorg|699 said:

By repeatedly tapping on a message header bar, one can add arbitrarily many frames to the navigation stack

Separately, it'd probably be good to fix the fact that it's so easy to do that in a loop. When you're already looking at a given page, there's not much value in pushing a new copy of the same page onto the navigation stack.

So, concretely, if you're looking at a message list for a single conversation (either topic or DMs), the recipient header probably shouldn't be clickable to navigate redundantly to the same conversation.

Mostly the recipient header itself is redundant in that case, and Vlad's design calls for changing it: #1039. But there are a couple of open questions there, and perhaps in the meantime as a quick fix we should just make it not clickable.

[chrisbobbe]

Another report of this today: https://chat.zulip.org/#narrow/channel/48-mobile/topic/Stacking.20of.20screens.20issue.20in.20message.20screen/near/2008440

[lakshya1goel]

Hey, I want to work on this.

[lakshya1goel]

Hey, here is the screen recording of the implementation.

WhatsApp.Video.2024-12-20.at.9.28.48.PM.mp4

[chrisbobbe]

Thanks! I've assigned this issue to you; I'm eager to see a PR.

[lakshya1goel]

@chrisbobbe I have raised the PR. Please review it and let me know if anything else needed.