[wp-trac] [WordPress Trac] #50666: Size limit not correctly applied for sitemaps index

[WordPress Trac]

#50666: Size limit not correctly applied for sitemaps index
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 Reporter:  swissspidy    |      Owner:  swissspidy
     Type:  defect (bug)  |     Status:  assigned
 Priority:  normal        |  Milestone:  5.5
Component:  Sitemaps      |    Version:  trunk
 Severity:  normal        |   Keywords:  needs-patch needs-unit-tests
  Focuses:                |
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 Sitemaps have a few [https://www.sitemaps.org/protocol.html#index size
 restrictions]:

 * each Sitemap file that you provide must have no more than 50,000 URLs
 * Sitemap index files may not list more than 50,000 Sitemaps

 The latter is seemingly enforced in
 `\WP_Sitemaps_Registry::get_sitemaps()`, but actually this method only
 limits the number of sitemap providers, not the amount of sitemaps all
 providers add to the index in total.

 Thus, this logic needs to be moved to
 `\WP_Sitemaps_Index::get_sitemap_list()`

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Ticket URL: <https://core.trac.wordpress.org/ticket/50666>
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