Add custom label (with backward compatible) with ComfyUI and LiteGraph dependencies

[MaraScott]

this refers to that issue

comfyanonymous/ComfyUI#3560 (comment)

it goals to add custom label from the py code on node def

by modifying the code this way

FROM

[...]
    def INPUT_TYPES(s):
        return {"required":
                    {"images": ("IMAGE", ), },
[...]
    RETURN_TYPES = ("IMAGE", "MASK")
[...]

TO

[...]
    def INPUT_TYPES(s):
        return {"required":
                    {"images": ("IMAGE", {"label": "Images (custom label)"}), },
[...]
    RETURN_TYPES = ("IMAGE", "MASK")
    RETURN_LABELS = ("IMAGE (custom label)", "MASK (custom label)")
[...]

with ComfyUI dependency pull-request comfyanonymous/ComfyUI#4940
and litegraph dependcy pull-request Comfy-Org/litegraph.js#150

[huchenlei]

Can you explain why this change is necessary? Currently you can already specify param name and return values name.

[MaraScott]

As far as I know, the input para name will be use in the kwargs so you can't set a param name with spaces in it, same for output when you want to access it via js through links you need a technical name.
This labels adds a UI display which don't get involved in the backend logic.
What do you think?