Virtual Graph Paper

could you implement a way to use the "fill" function on grouped objects?
or maybe a way to merge two lines into one?
as far as I've seen, there seems to be no way to fill shapes that weren't made with a single stroke.

Hi,

I plan to soon add a "Weld" operation that would join two or more line segments on overlapping points. Which could then be filled as if they were created in a single stroke.

A more general flood fill would also be nice, that might be possible at a later time.