Answer by Torbjørn T. for `edge quotes mid` TikZ issue
You need to add the tikzlibrary called quotes to use that syntax.\documentclass[border=2mm]{standalone}\usepackage{tikz}\usetikzlibrary{graphdrawing,graphs,quotes} % <-- new library...
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When I render this with LuaLaTex:\documentclass[border=4mm]{standalone}\usepackage{tikz}\usetikzlibrary{graphdrawing,graphs} \usegdlibrary{layered,trees,circular,force}\begin{document}\tikz \graph...
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