Lines don't render if the graph is built with a fill

[axelson]

Checklist

• Check other issues and make sure that it is not reported yet.

Versions and Environment

Elixir:

# elixir -v
Erlang/OTP 25 [erts-13.1.5] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit:ns]

Elixir 1.14.3 (compiled with Erlang/OTP 25)

Erlang:

# erl -v
Erlang/OTP 25 [erts-13.1.5] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit:ns]

Eshell V13.1.5  (abort with ^G)

Scenic:

# mix deps | grep scenic
* scenic 0.11.1 (Hex package) (mix)
  locked at 0.11.1 (scenic) 86845290
* scenic_driver_local 0.11.0 (Hex package) (mix)
  locked at 0.11.0 (scenic_driver_local) 77b27b82

OS:

Linux Mint

Steps to reproduce

Broken:

    graph = Graph.build(font: :roboto, font_size: @text_size, fill: :white)

    graph =
      graph
      |> add_specs_to_graph([
        text_spec(info, translate: {20, 40}),
        text_spec(@note, translate: {20, 120}),
	# This only renders if there's no fill set on the graph
        line_spec({{0, 400}, {450, 400}}, stroke: {4, :red}),
        rect_spec({width, height}, fill: :transparent)
      ])

works:

    graph = Graph.build(font: :roboto, font_size: @text_size)

    graph =
      graph
      |> add_specs_to_graph([
        text_spec(info, translate: {20, 40}),
        text_spec(@note, translate: {20, 120}),
	# This only renders if there's no fill set on the graph
        line_spec({{0, 400}, {450, 400}}, stroke: {4, :red}),
        rect_spec({width, height}, fill: :transparent)
      ])

Note: even passing a fill directly to the line (or line_spec) isn't enough to allow the line to render.

I've created a reproduction repo here: https://github.com/axelson/repro_scenic_line_fill

Expected Behavior

The line to render regardless of the fill

Actual Behavior

The line does not render if the fill is set on the graph