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Previous to this change, attachment filenames in outgoing emails could only ever be derived from their paths (passed in as a numerically indexed array of `$attachments`). This changeset adds support for passing an associative `$attachments` array, where the key strings will be used as filenames instead. Includes 2 new unit tests to ensure both array formats continue to work as intended. Props johnjamesjacoby, ritteshpatel, swissspidy, syntaxart. Fixes #28407. git-svn-id: https://develop.svn.wordpress.org/trunk@55030 602fd350-edb4-49c9-b593-d223f7449a82