Since support for PDF previews were added in [38949], it's possible that the generated image file could overwrite an existing image file with the same name. This uses `wp_unique_filename()` to avoid this issue and adds a '-pdf' identifier on the end of filenames. Props gitlost, derosj, mikeschroder, joemcgill. Fixes #39875. See #31050. git-svn-id: https://develop.svn.wordpress.org/trunk@40130 602fd350-edb4-49c9-b593-d223f7449a82
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