Easily create walls in lines or rectangles. Select an area to surround it with walls.

Options include setting wall thickness for normal or alternate (SHIFT) select, and whether to place ghosts or place walls directly, and whether to deconstruct trees and rocks.

version 1.2.3; refactor mod code and fix bug introduced in 1.2.2 as well as original bug as mentioned1.2.1
version 1.2.2; simply ensure mod portal thumbnail is included in package.
version 1.2.1; fix deconstruct/place bug reported by https://mods.factorio.com/user/Amin_Fd76
version 1.2.0; update for Factorio 1.1.x
version 1.0.2; removing more debug code, and prevent bugs from quitting level
version 1.0.1; removing debug code
version 1.0.0 ; refactor code and remove some bugs with drawing.