[wp-trac] [WordPress Trac] #50881: Add a class_exists() check to Plural_Forms class

[WordPress Trac]

#50881: Add a class_exists() check to Plural_Forms class
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 Reporter:  SergeyBiryukov  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  5.6
Component:  I18N            |    Version:
 Severity:  normal          |   Keywords:
  Focuses:                  |
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 Background: #41562

 Unlike other POMO classes, `Plural_Forms` introduced in [41722] doesn't
 have a `class_exists()` check.

 This is causing issues when multiple versions of the library are included
 side by side, e.g. on WordPress.org Rosetta network.

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Ticket URL: <https://core.trac.wordpress.org/ticket/50881>
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