Add patterns filter by post type

[renatho]

Fixes #5187

Changes proposed in this Pull Request

• After a deeper investigation of the mentioned issue, it seems safe to use the current_screen hook to register the patterns based on the current post type. It wasn't really working on some beta versions, but it was fixed after the final release with this commit (basically, the server adds our registered patterns to the initial setup of the patterns - writing it in the HTML, and the other come later in the async fetch). Anyway, I asked for a confirmation here just to make sure I'm not missing anything.

Testing instructions

• In WP 6.0, create a new Course, and make sure only 3 patterns are listed in the patterns.
• Create a new Lesson, and make sure the other 3 patterns are listed in the patterns.
• It's nice to also test in WP 5.8 and 5.9.

[aaronfc]

Looks good and works well! Some things I noticed with older WP versions but I think none are really important and we can "ignore" them being only minor visual things and for old WP versions.

Using WP 5.9.3

• Some previews are displayed with an excessively long height. Example:

Using WP 5.8.4

• Some previews are not displayed (not only for Sensei LMS but for all categories). Examples:

• Minor: Modal does not have a cross to close it. Clicking out of the modal or pressing escape works.

[renatho]

Hey @aaronfc ! Thank you for your review!

Some previews are displayed with an excessively long height.

I had noticed it and registered it as a known issue in: #5173. I mentioned that we could wait until the final patterns to see if it will happen, and if yes, we could explore that to see what workaround we could implement. One idea I had added there is set a maximum height to the thumbnails. Does it make sense for you? To make sure we don't forget it, I'm also adding it to a comment in this issue.

Some previews are not displayed (not only for Sensei LMS but for all categories)

I thought it had gone away. 😞 Reopened this issue.

Modal does not have a cross to close it.

Good catch! Fixed in f22a70a

[aaronfc]

Everything clear!

Looks good and works well! 🚀