Hugo generates the images under _gen/images and copies it later to public.
During this copy could be a nice rename to shorter filenames.
head_120.jpg or head_84_120.jpg
Hugo can watch the filenames per directory and can extend it for 2 letters in case of collision.
This should generate mostly the same names.
This must be reflected in references!
I started making a minimal repo to accompany the GitHub issue, however I can no longer reproduce the long filename error for generated resources with the latest Hugo on Windows 10.
Sometime within the past year (around September, I think) I ran into this problem a couple of times and I noticed that Hugo appended the file hash to the original filename for generated resources.
Now, as far as I can tell the latest Hugo replaces completely the original filename for generated resources and therefore the behavior I mentioned above no longer occurs.
So I will not be filing a GitHub issue.
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