Generate topic links as permalinks, using /with/

[gnprice]

This is part of the upcoming Zulip feature zulip/zulip#21505 , and a followup to #5866.

Since #5866, mobile understands the new topic permalink URLs. Once the web app does too (PR zulip/zulip#30114), we should start generating them, conditioned on that Zulip feature level. This is the mobile counterpart to PR zulip/zulip#30644 zulip/zulip#32449. (The earlier PR got split in two.)

Specifically, in the topic action sheet we have an option "Copy link to topic". That option should start producing topic permalinks, just like the similar option in web's left sidebar will do.

Related

• Overall feature: Provide permalinks for topics zulip#21505
• A prerequisite change in the server: topics: Convert topic links to permalinks. zulip#30114
• A loosely-corresponding change in the server: markdown: Convert topic links generated by "#-mentions" to permalinks. zulip#30644
• The corresponding change in Zulip web: topics: Change topic links of left sidebar to use new permalinks. zulip#32449

[chrisbobbe]

Looks like we're still waiting for zulip/zulip#30114; when that's merged, we'll know what feature level to use. (Earlier today I mistakenly thought this was ripe to work on.)

[alya]

ETA on server: August 2024

[gnprice]

I think this is ripe to work on now; the server/web PRs look like they're moving forward again.

For the feature-level conditional, we can use 271, introduced by zulip/zulip#30114 which made the web app start understanding the new links. We don't need to limit it to servers with zulip/zulip#30644 or zulip/zulip#32449, where server or web would generate the new links.