When using geom_edgetext to place text in the middle of edges borders appear around the text, and they cannot be removed with line.size, or when swiching to geom_edgelabel, and then utilizing label.size.
Are you still having this issue, and could you please post a reproducible example? I do not figure the issue, and suppose that it can be solved with passing some argument to geom_text, which is what geom_edgetext uses.
When using geom_edgetext to place text in the middle of edges borders appear around the text, and they cannot be removed with line.size, or when swiching to geom_edgelabel, and then utilizing label.size.