Comment likes being "lost" after refresh in Reader

[daledupreez]

Quick summary

As reported in p1702541010734839-slack-CBG1CP4EN, we have a user reporting an issue where liking a comment in the Reader and then refreshing the page causes the like to disappear.

The behaviour seems very similar to #84213, which was a very similar behaviour for posts in the Reader that we addressed a few weeks ago.

Steps to reproduce

1. Visit a feed in the Reader where one or more posts have comments
2. Like a comment and then refresh the page.

You may need to throttle your network connection to make it easier to reproduce.

What you expected to happen

The comment should show as liked by the current user after the refresh.

What actually happened

The comment doesn't always show as liked after the refresh.

Impact

Some (< 50%)

Available workarounds?

Yes, easy to implement

Platform (Simple and/or Atomic)

No response

Logs or notes

I took a quick look at this as I worked on the previous issue with likes for Reader posts, and it looks like we have a related issue to do with client-side state.

When I took a look at https://github.com/Automattic/wp-calypso/blob/6c2c5f9e3bd92a81a4b926161ae7032e6e31064b/client/state/data-layer/wpcom/sites/comments/likes/new/index.js, it seems like we're only updating the client-side state after we get the response back from the server. If that's true, it would be more user-friendly to optimistically update the client-side state and roll the update back if there was an error.

[markbiek]

I'm not able to reproduce this any more, even throttling my connection.

Do we know if we're still getting reports of this issue?

[sixhours]

I've also been unable to reproduce this FWIW.

[sixhours]

Since two of us can't reproduce this and we're unlikely to work on Reader enhnancements soon, I'm going to close it for now.