[wp-trac] [WordPress Trac] #63917: Block attributes cannot end in "\"

[WordPress Trac]

#63917: Block attributes cannot end in "\"
--------------------------+--------------------
 Reporter:  jonsurrell    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  6.9
Component:  Editor        |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 - Create a new post `/wp-admin/post-new.php`.
 - Add a "More" block (`/more`).
 - Replace the default text with the backslash character: `\`.

 Check the editor to reveal this serialized block:

 {{{#!xml
 <!-- wp:more {"customText":"\\u0022} -->
 <!--more \-->
 <!-- /wp:more -->
 }}}

 Notice the `customText` string is invalid, it's missing a closing `"` and
 does not represent the intended attribute value.

 When the post is saved and loaded, the custom text (and any other
 attributes) are lost due to invalid JSON encoding.

 -----

 This is a companion to the issue reported in
 [https://github.com/WordPress/gutenberg/issues/16508 GB#16508].

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Ticket URL: <https://core.trac.wordpress.org/ticket/63917>
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