Using inv() before or after println() makes a difference

[ghjwp7]

This may be a feature or a quirk, rather than a bug, but perhaps could be noted in the docs. Also, while the code below that demonstrates the issue only illustrates it with inv(), perhaps it's applicable to any ANSI color setting strings.

The observed behavior (on an Ubuntu 20.04, Linux 5.4.0 system) is that if say Crayon(background = :green) has been in effect, and an inv() for it is printed after a println() instead of before, then there's a green background for the tail of the upcoming line (which I didn't expect).

#!/usr/bin/env julia
# -*- mode: julia; coding: utf-8 -*-
# Tues 11 Jan 2022 - j-waldby
module testcrayoninv
using Crayons
green = Crayon(background = :green)
blue  = Crayon(background = :blue)

function plines(nlines, befor, flu)
    perline, lex, c = 1:5, 4, 'a'
    println("\nbefor is ", befor, "    flu is ", flu)
    for l in 1:nlines
        print("Line ", l)
        if l%4<1  print(green)       end
        if l%5<1  print(blue)        end
        for p in perline
            lex = (lex+5)%9
            c = c<'z' ? c+1 : 'a'
            print("  ", join([c for i in 1:lex]))
        end
        if befor
            if l%4<1  print(inv(green))  end
            if l%5<1  print(inv(blue))   end
            if flu    flush(stdout)      end
        end

        println()  # Print the inv's before or after this println()

        if !befor
            if l%4<1  print(inv(green))  end
            if l%5<1  print(inv(blue))   end
            if flu    flush(stdout)      end
        end
    end
end
plines(11, false, true)
plines(11, false, false)
plines(11, true,  false)
plines(11, true,  true)
end # module