[wp-trac] [WordPress Trac] #57500: Plugin update results in mixing files of old and new versions

[WordPress Trac]

#57500: Plugin update results in mixing files of old and new versions
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 Reporter:  Chouby                               |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Upgrade/Install                      |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  needs-testing needs-testing-info     |     Focuses:
  reporter-feedback                              |
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Comment (by Chouby):

 I'll try to collect more informations from users reporting the issue.

 @afragen We are using a similar modules structure as Jetpack. Our modules
 are automatically loaded by the line you pointed. We just need a file
 `load.php` in a subdirectory of `modules/` to load it. That explains why a
 file from the old version is loaded by the new plugin. The fatal itself is
 due to the fact that and old class from an old file is loaded and is not
 in the composer autoloader classmap as the class has been removed from the
 new version.

 We can manually reproduce the error by:
 1. install the version 3.3
 2. overwrite the files with the version 3.3.1 without deleting the version
 3.3
 So we don't need an addon to attempt to load a non existing file. When we
 examine the backtrace provided by the users, it's all internal to
 Polylang. Reinstalling properly the plugin solved the issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57500#comment:6>
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