Create fillable areas from borders

New function request:

Select 2 or more adjoining curves → use them as the border for a new filled curve/polygon; when nodes on those original curves are moved around the new filled area adjusts accordingly.
(vs. current workflow of having to carefully duplicate existing edges, and whenever we adjust a node on one curve we carefully align its duplicate’s node)

Simple example: the triangular region between the esisting hexagons could be selected and filled or made into a new closed shape that could then be filled. Nodes could be ‘sticky’ so that changing one curve’s node will drag its duplicate along…? Thanks for considering! (o:
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