3.19 - Preload Fonts - Data Clearance

[piotrbak]

User Story
As a user, I want to clear preload fonts with the same actions as priority elements

Acceptance Criteria

• Full clear when
  • Clear priority elements from admin
  • Switch theme
  • Change permalinks
  • Domain change
• Partial clear when
  • Clear priority elements of this URL
  • Add/edit/delete post
  • Update comments count

[Khadreal]

Scope a solution ✅

• Hook a callback to switch_theme, permalink_structure_changed, rocket_domain_options_changed, rocket_after_clean_domain
• To clear priority elements of this URL, we should create a Factory class for Fonts similar to this and add the factory container to this
  and hook a callback to delete_post, wp_update_comment_count, wp_trash_post, clean_post_cache
• Add test

Estimation
[S]

[jeawhanlee]

Good job @Khadreal

Although, From my point of view, I do't see us implementing anything in this task because we have shared admin subscriber for all performance hints features here which handles clearing in it as well. so by default this task should be settled when we implement this for db handling.

cc @wordpressfan

[Khadreal]

Should this be move back to need grooming ? cc @jeawhanlee

[jeawhanlee]

I don't think so, pinging @MathieuLamiot for direction.

[MathieuLamiot]

Same as #7250

[jeawhanlee]

This issue can be tested when this is implemented