First clicked image smaller

[au lait]

Affected version

2.3.9

As you can see in this test thread, the image that is clicked on first is reduced in size in the display.
Although it has the same dimensions as the others...
If you use the <> keys to scroll through everything, everything is fine!

https://xenforo.com/community/threads/post-with-lots-of-big-images.234325/

video evidence

 

[Steffen]

I can reproduce this issue in Chrome 147, Firefox 149 and Safari 26.

 

[Steffen]

This is broken since XenForo 2.3.8 and its changes to the "lightbox.less" template. Removing the two lines "width: 960px;" and "height: 540px;" seems to fix this issue (but I'm not yet sure whether that could cause other bugs).