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GIFs animate in thumbnail regardless of animation option
(media.tenor.com)
As title. There's an option in the settings menu to disable animations. However GIF image posts animate in thumbnail view regardless.
From reviewing the code it removes the transition animation when you click on an image to view it full screen (saving you 0.2 of a second). I think it was added when that animation wasn’t working correctly. Maybe it’s time to repurpose it now we’re actually seeing gifs being used a little more…