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There was a problem with core\update\code_manager::unzip_plugin_file() if it was used to extract a plugin package into a non-empty target directory and the plugin package root folder was being renamed at the same time. The problem was caused by the underlying helper method rename_extracted_rootdir() that worked only for ZIPs extracted to an empty temporary location. When the plugin was extracted to the actual dirroot with other existing plugin folders present, the method failed badly. The solution in the patch is to always extract the ZIP into a temporary empty location, perform the eventual root renaming there, and only then move the extracted contents to the final destination. Additionally we are changing the behaviour of the rename_extracted_rootdir() method so that now it throws exception if the plugin package contains multiple root folders (it should not happen in normal situations as such a plugin would not pass the pre-install validation). Unit tests did not catch this bug before because in the tests, the target directory had been empty. Now we are adding a new directory "aaa_another" to the target location to test in more realistic environment. Tests for the new behaviour of the renaming method are added, too. p.s. I noticed that moodle_exception class was not imported into the namespace and this is fixed now too (and covered with unit tests).