[Feature Request] next gen image previews

[G2G2G2G]

I don't see any mention of them so throwing it out there since browser support is coming faster than any other formats that ever existed.
When you view a jxl or avif it currently says: Binary file not shown.
For now a setting in the app.ini file would make sense I guess to allow them to be previews for whoever has it enabled.

All major browsers can now be enabled / already ship with it enabled.
Jpeg XL thumbs (.jxl)
Mime type: image/jxl
https://caniuse.com/jpegxl

AVIF (AV1's image from the Alliance for Open Media)
Mime type: image/avif
https://caniuse.com/avif

[noerw]

This probably won't be fixed in upstream dependencies as we use a patched version of https://pkg.go.dev/net/http#DetectContentType, which only implements an unmaintained spec.

Scratch that, it should be supported in upcoming go 1.17

Scratch that too, this detection is based on file extension, which we currently ignore.

Here's some go code that (incorrectly) adds avif support: gabriel-vasile/mimetype#160
Maybe we could just use that lib

[G2G2G2G]

You're opening each file to read it's type for how you treat in the browser?

animated.avif: ISO Media, AVIF Image Sequence

still.avif: ISO Media, AVIF Image

[KN4CK3R]

AVIF support was added in gabriel-vasile/mimetype#210