Backslashes are removed from result clarification content

[brianhogg]

Reproduction Steps

1. For a quiz question, add in content for the Result Clarification which includes a backslash
2. Save Changes
3. Refresh the page

Expected Behavior

The backslash characters are preserved.

Actual Behavior

The backslash characters are removed.

Tech Notes

From investigation, the slashes are present right up until the call to update_post_meta in abstract.llms.post.model.php::update_meta_properties. The documentation states that there is a call to stripslashes() so to compensate, we need to call wp_slash() beforehand:

https://developer.wordpress.org/reference/functions/update_post_meta/#more-information

However we're also stripping the slashes within LLMS_Admin_Builder::handle_ajax()

    $request['llms_builder'] = stripslashes( $request['llms_builder'] );

We may want to avoid doing this?

This issue has be recreated:

• [ ] Locally
• [ ] On a staging site
• [ ] On a production website
• [ ] With only LifterLMS and a default theme