Animated GIF images: the .Width and .Height properties are incorrect when image cache is empty (first run)

[jmooring]

Reference: https://discourse.gohugo.io/t/44751

Tested with v0.101.0 and v0.113.0. This is not a new bug.

If you have an empty image cache (resources/_gen/images), the .Width and .Height methods return the original dimensions instead of the resized dimensions when you run hugo or hugo server for the first time. Note that the images in the cache (and the published images) are the correct size (i.e., resizing was successful).

If you run hugo or hugo server again (the image cache is not empty) the .Width and .Height methods return the correct (resized) dimensions.

This behavior is limited to animated GIF images. Non-animated GIF images work as expected, as do JPEG, WebP, etc.

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Reproducible example (includes an animated GIF and a non-animated GIF):

git clone --single-branch -b hugo-forum-topic-44751 https://github.com/jmooring/hugo-testing hugo-forum-topic-44751
cd hugo-forum-topic-44751
rm -rf resources/_gen/images/ && hugo server

Then stop the server, and restart without clearing the image cache:

hugo server

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