When uploading a file at Commons using Special:Upload, the page cannot obtain a thumbnail of the file selected for uploading -- the throbber just spins continuously. However, if all the fields are filled out, the file uploads normally.
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Details
| Project | Branch | Lines +/- | Subject | |
|---|---|---|---|---|
| mediawiki/core | master | +2 -1 | Fix classname mismatch between upload js and templates/thumbnail.html |
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Is that reproducible with any kind of browser (which ones were tested?) and with any kind of file format (which ones were tested?)? Does that also happen with UploadWizard?
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Change 233345 had a related patch set uploaded (by Brian Wolff):
Fix classname mismatch between upload js and templates/thumbnail.html
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Change 233345 merged by jenkins-bot:
Fix classname mismatch between upload js and templates/thumbnail.html
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I encountered the issue while uploading JPEG files using the latest version of Mozilla Firefox. Not sure when the issue started – I noticed it a few days ago.
Special:UploadWizard occasionally fails to obtain thumbnails and displays "broken picture" images, but I don't know if this has the same cause as this current issue with Special:Upload.
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The fix will roll out to Wikimedia wikis over the course of this week, see https://www.mediawiki.org/wiki/MediaWiki_1.26/Roadmap for details. I don't think this is critical enough to backport now, but if you do, it can be done.