Steps to replicate the issue (include links if applicable):
What happens?:
a png thumb file is displayed
What should have happened instead?:
a webp thumb file is displayed
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
Hi @C.Suthorn, unfortunately this Wikimedia Phabricator task lacks some information.
If you have time and can still reproduce the situation: Please add a more complete description to this task. That should be
A good description should allow any other person to follow these steps (without having to interpret steps) and see the same results. Problems that others can reproduce can get fixed faster. Thanks.
This applies to all 29975 webp files at commons. Use mediasearch to choose any of them. On the file description page hover the mouse over the thumb download links and it will show a download url ending in ".webp.png" (and it is really silly to generate a png thumb from a png file. the webp will be smaller).
Please include such steps. So I have to go to https://commons.wikimedia.org/wiki/Special:MediaSearch?type=image to find something like https://commons.wikimedia.org/wiki/File:Johnrogershousemay2020.webp (the first one I tried had no thumb images). Please always include links in the future so other people save time - thanks.
I'd say this is not a bug as there is no code behaving wrongly. It's a feature request as code to handle this likely does not exist...
In my testing, webp previews are not visible at all in the uploader. It looks like webp needed to be added to the list of content types the javascript handles, I've made that change here: https://gerrit.wikimedia.org/r/c/mediawiki/core/+/928999/
This ticket lacks argumentation. There is no case provided for why a webp preview should be provided.
Even if there were argumentation, almost all our thumbnails are either png or jpg. Webp optimized thumbnails are conditionally used when performance benefits from it and your browser supports it. I see no reason why webp and only webp should use webp thumbnails and other thumbnails are not taking into consideration.