Ckpt/Lora subdirectories and previews no longer work after converting to a group node

[Bocian-1]

After converting a set of nodes into a group node, the ckpt/lora loader widgets will no longer respect combo++ tree (submenu) setting or the ModelInfo setting.

Instead the models are displayed as a list with paths starting from the loras directory and the preview images will do not display when mousing over.

I say 'no longer' but while it did use to work before, I've experienced issues with the preview images in group nodes before as well. This wasn't too bad as the solution was to check on a standalone node first. The issue with submenus is much more problematic.