[wp-trac] [WordPress Trac] #65379: Elements: Guard against non-string className in render filter

[WordPress Trac]

#65379: Elements: Guard against non-string className in render filter
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 Reporter:  aaronrobertshaw  |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  7.1
Component:  Editor           |    Version:  trunk
 Severity:  normal           |   Keywords:  gutenberg-merge
  Focuses:                   |
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 This ticket tracks the backport of PHP files for the following Gutenberg
 update:

 https://github.com/WordPress/gutenberg/pull/78841

 Adds a safeguard in elements block support rendering to prevent fatal
 errors when a block’s className attribute is not a string. The backport
 updates `wp_render_elements_class_name()` to bail early and return block
 content unchanged for invalid `className` values, and includes a PHPUnit
 test covering this regression case.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65379>
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