Support JPEG XL

Feature requests
1

I save my images in JPEG XL (JXL) format. It would be ideal to support this format in the built-in viewer, since opening natively is inconvenient.

At least give us the ability to disable the previewer entirely for unknown formats?

2

Thanks for the suggestion, the browsers do not have current support for this format, but there are some other options like GitHub - niutech/jxl.js: JPEG XL decoder in JavaScript using WebAssembly (WASM) which we can use to show preview of such files. Where do you get such JXL files ?

3

I encode the files automatically myself using the official command-line tools (libjxl-tools on Debian) or manually using Gwenview (or IrfanView on Windows).

(I was able to disable the default plain text previewer by making single click open the file natively)