Webviews: Not logged in state for comment box that needs authentication

[reginabally]

This is a follow-up issue for #16278 and an additional bug discovered when viewing a post with a comment box that needs authentication.

Ticket: 4003515-zd-woothemes

Expected behavior

For issue reported in #16278, the user expects to be logged in to the webview since they're already logged in to the app. Also, they should be able to comment on the post that requires authentication without the need to log in twice on the same post.

Actual behavior

We need to log in twice to be able to like and comment on the same post through webview.

Steps to reproduce the behavior

1. Go to Reader, select a post that has a custom domain mapped to the site and with the comment box option "Users must be registered and logged in to comment" enabled.
2. Open up the post on webview.
3. Tap the "Like" button and see the log in prompt.
4. Log in with WordPress.com account.
5. Tap the "Like" button again and see the action is registered.
6. Scroll down to the comment box and notice I need to log in again to comment.
7. Tap the log in link to login with WordPress.com.
8. Now I can comment on the post.
9. Close the app and repeat step 1 again. Notice that I need to log in again to like and comment.

It was also worth noting that the user who reported the issue was sometimes seeing the same notice requesting a log in to comment even after they performed step 7. You can see more description of the issue in the blog post linked in the ticket.

Screen recording: https://d.pr/v/X8NyDF/UaukldCFYM

Tested on iPhone SE, iOS 14.5.1, WPiOS 17.3

[mdrockwell]

User replied saying that after they go through the login flow in the web view, they are still being told that they need to login in order to comment. They shared a screen recording in the ticket.

[reginabally]

Adding the screen recording shared by the user (with permission): https://d.pr/v/Sk6sfN/XbBlyPlQxV

The user also noticed that on certain posts, they need to fill up the name, email address, and blog address before they can comment, even though they have logged in when they like the posts.

I was able to reproduce this in the app's webview when I set the site's discussion settings as:

• Comment author must fill out name and e-mail (enabled)
• Users must be registered and logged in to comment (disabled)

If I view the same post on the web browser, I can see that I'm logged in and I don't need to fill up the fields in order to comment.

[chipsnyder]

More validation needs to be done on this but I wondered if this could use a similar fix as what's in #16920

[annbingle]

Had one report today similar to this 30955277-hc

[reginabally]

Another report in 6030425-zd-woothemes.

Navigate to this blog from the Reader search, for example - natalietheexplorer.home.blog. Open a post to read. You can read and comment without any problem.
Now if the same blogger comments on your blog and you go to notification section, then navigate to their blog from there. Click on a post. You can like - app will likely run a script to log you in. But now try to comment. You will see the box for adding name and email as if the app doesn't recognize your login.

[mdrockwell]

Stuck in a loop, not able to login for the comment section of a site:

Whenever I go to the POCKET CASTS COMMUNITY Website using this App (Jetpack) then click on LOG IN, it will always automatically log me in, but when it shows the community/Comment that I clicked on in the Jetpack App again, it still says that I need to Log in, it keeps doing that in a circle, Click on LOG IN, Automatically Log in, be told thaf I have to log in.

6868353-zd-a8c