Mega update '26 Q1

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Optimistically Q1. I haven't really had the ability to do much work on personal projects lately and I really don't know when I will be able to actually clean this up and make it the official version.

Among other random stuff, this pull adds support for SpargeAttention, animated previews, a current preview endpoint visible via web access, Hunyuan and LTX previewing support. See below.

Note: For LTX-2 previews, you need to wrap the guider with the BlehFixGuiderPreviewing node.

That pull also supports animated previews, but ComfyUI won't actually show them to you. bleh_animate_preview can be set to none, both, video or batch. It is disabled by default.

There's a publish_last_preview setting in the config that can be used to add /bleh/last_preview (the actual image) and /bleh/last_preview.html (extremely simple page that refreshes the preview every 10 sec). These will be under your normal ComfyUI URI so something like http://127.0.0.1:8188/bleh/last_preview.html. This is disabled by default, anyone that can access your ComfyUI instance would be able to see what you're generating.

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For previewing LTX 2.3 with the normal or wide previewer model (in development, currently) you'll need to wrap the guider like this:

LTX models default to 24 FPS so you only need to set FPS there if you're using something different. ComfyUI won't actually animate previews in the workflow unless you use nodes 2.0 mode (and I certainly don't). If you want to see animated previews, the best way is to enable the publish endpoint in blehconfig.yaml (see the note in the initial comment about the risks, but if someone can access your ComfyUI instance they can already do that stuff). Basic example config that enables publishing previews and will use animated previews when available:

previews:
  # Or float16 - saves memory. I've been using bfloat16.
  preview_dtype: bfloat16
  animate_preview: video
  publish_last_preview: true