[Feature Request]: Extra networks - Support for ssmd_cover_images

[catboxanon]

Is there an existing issue for this?

• I have searched the existing issues and checked the recent builds/commits

What would your feature do?

This feature would be to support the ssmd_cover_images key that can contain arbitrary images in extra network files' metadata (such as LoRA), and to display these in the webui when no user-provided preview image is set.

Additional information

This functionality was implemented nearly a year ago in kohya-ss/sd-webui-additional-networks#77, before LoRA support came to the webui and when this was the only extension to support LoRA.

The webui is aware of this key's existence, but currently all it does is filter it out from the metadata view, understandably so.

stable-diffusion-webui/extensions-builtin/Lora/network.py

Line 32 in daa1b33

metadata.pop('ssmd_cover_images', None) # those are cover images, and they are too big to display in UI as text