Add some samples as Sensei patterns

[renatho]

Fixes #5137

Changes proposed in this Pull Request

• It registers some samples as Sensei patterns (copied from the patterns directory). There are 2 methods to register patterns for courses or lessons.
• It also registers the Sensei category.

Testing instructions

• Create a new course, navigate through the wizard, and make sure you see the registered patterns in the last step.
• Also, check that you can see the patterns in the inserter filtering it by "Sensei LMS" category.
• Repeat the test with a new lesson.

Known issues

• Sometimes, I see some weird behaviors with the BlockPreview component, displaying it with the wrong height. If I activate the Gutenberg plugin, it works better. I think we could postpone our decision of what to do, at the moment that we create the final patterns to see if the issue will happen with them. If yes, I think we could set a maximum height to the thumbnails as a temporary workaround until the Gutenberg fix is in the versions we support.

Screenshot / Video

[renatho]

I needed this method in order to identify the post type in the init hook because the documentation says that it should be registered in this hook.

[aaronfc]

Looks promising but it is not working for me.

First of all, as a word of advise, I had some issues testing because I had a code snipped from your previous pull request which was overriding the new behaviour... took me a while to identify that haha. But I disabled it and it is still not working.

I am using WP 6.0 and at least for me the pattern category is not being correctly created. I have identified the issue being that the get_early_post_type returns false when the XHR request is being done from the frontend to get the patterns to wp-json/wp/v2/block-patterns/patterns?_locale=user.

I am going to test also in WP 5.9.
Edit: It is working fine in WP 5.9. Where the request to block-patterns/ is not seen in the network tab.

[aaronfc]

Maybe you can extract this category to a constant?

[renatho]

Moved to a constant in this commit: 7b9332b

[renatho]

I am using WP 6.0 and at least for me the pattern category is not being correctly created. I have identified the issue being that the get_early_post_type returns false when the XHR request is being done from the frontend to get the patterns to wp-json/wp/v2/block-patterns/patterns?_locale=user.

Hey @aaronfc! Good catch! I was thinking to return to the approach I started using - use the current_screen hook instead of the init hook, which the documentation recommends, but it seems it's not reliable.

[renatho]

Based on the last comments, I changed this PR to register the patterns regardless the post type, and I created another issue to work on that check since it's not very simple.

[aaronfc]

Not sure if this was ready for a new review but I tested and found some (new?) issues: (Tested both in WP 5.9.3 and WP 6.0).

Pattern disappears after closing the modal (courses)

Kapture.2022-05-26.at.09.09.36.mp4

Wizard is not working when creating Lessons

Edit: The last one (Wizard not working in Lessons) is happening also in feature/course-lesson-wizard. Reported here and looking into it.

[renatho]

@aaronfc, it was ready! I forgot to re-request the review.

Pattern disappears after closing the modal (courses)

The idea of this PR was to register the patterns only. This logic to apply was just a temporary function to simulate that it was working. It's being implemented in #5179

Wizard is not working when creating Lessons

For this, I saw that you are already working in a PR with the fix, right?

[aaronfc]

Then... Looks good and works as described! 🚀