Wip: Longcat-Image support

[stduhpf]

for #1052

sd.exe --diffusion-model ..\ComfyUI\models\unet\LongCat-Image-Q8_0.gguf --vae ..\ComfyUI\models\vae\flux\ae.safetensors --cfg-scale 4.0 --sampling-method euler -v --clip-on-cpu -p "A cinematic, melancholic photograph of a solitary hooded figure walking through a sprawling, rain-slicked metropolis at night. The city lights are a chaotic blur of neon orange and cool blue, reflecting on the wet asphalt. The scene evokes a sense of being a single component in a vast machine. Superimposed over the image in a sleek, modern, slightly glitched font is the philosophical quote: 'THE CITY IS A CIRCUIT BOARD, AND I AM A LONG CAT.' -- moody, atmospheric, profound, dark academic" --preview proj --steps 20 --qwen2vl ..\ComfyUI\models\clip\Qwen2.5-VL-7B-Instruct.Q4_K_M.gguf --diffusion-fa --color -W 1024 -H 1024

Test models can be found there: https://huggingface.co/stduhpf/LongCat-Image-gguf/tree/main

[wbruna]

That does look a bit like a circuit board...

[stduhpf]

TODO for when image generation works

[stduhpf]

I can't figure out what I'm doing wrong, I think it is supposed to be working just like Flux1, but with different PE indices and Qwen Text Encoder.... Maybe I'm missing an important detail but I can't find it.

[stduhpf]

I tried using my SplitAttention thing on a Flux model converted to diffusers format, and

I guess I found what is not working. I will try converting LongCat to Flux format and see if it works.

[stduhpf]

I think I got it?

With the padding fixed, but with diffusers format:

[stduhpf]

With the character-level tokenization trick:

Might need testing to make sure the current implementation supports languages that don't use the latin alphabet. Also for now it's applied to text wrapped in single quotes ( ') only.

[stduhpf]

Oh no, why are there so many conflicts now?

[stduhpf]

Using ' as a quote delimiter was a bad idea because it's the same symbol used for apostrophes. I will change it to detect " instead