Wire the per-slot mask button to ComfyUI's MaskEditor (frontend 1.45):
point the editor at the slot image via node.images + previewMediaType,
open it through the Comfy.MaskEditor.OpenMaskEditor command, poll for
the saved clipspace ref, bake the alpha channel into a grayscale mask
(white = painted) and POST it to /grid_pool/set_mask.
Also fixes DOM-widget sizing for frontend 1.45: size via the getMinHeight
option (the computeLayoutSize path) with NO max, so the grid fills and
grows with the node instead of detaching/locking on click; hide pool_id
via widget.hidden; suppress node.imgs so a registered output never
reserves a preview strip.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
EthanfelandClaude Opus 4.8
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