The frontend's right-side Properties Panel falls back to WidgetLegacy for
unregistered widget types, and WidgetLegacy.draw() writes widget.width
(≈panel width) onto the real widget object. The canvas DOM overlay honors
widget.width ?? node.width, so clicking a node with the panel open squashes
the widget content to the left until undo/recreate (ComfyUI_frontend #11574).
Setting hideInPanel: true on all addDOMWidget options keeps LM widgets out
of the panel entirely. Older frontends without the option ignore it safely.
Refs #979
Will Miao
42fa8294df