Upgrade to FontMetrics >= 0.5 leaves the example Scenic apps in an infinite crash loop on startup.

[skovsgaard]

As of FontMetrics v0.5 it appears the function, from_binary/1 has been removed. However, Scenic still attempts to call this from the Scenic.Cache.Static.FontMetrics module. This causes an infinite series of crashes and restarts during init.

Checklist

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

Versions and Environment

Elixir:

# elixir -v
Elixir 1.11.2 (compiled with Erlang/OTP 23)

Erlang:

# erl -v
Erlang/OTP 23 [erts-11.1.4] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe]

Scenic:

# mix deps | grep scenic
* scenic 0.10.4 (Hex package) (mix)
  locked at 0.10.4 (scenic) d4c0b7f2

OS:

Linux 5.11.22-100.fc32.x86_64 #1 SMP Wed May 19 18:58:25 UTC 2021 GNU/Linux

(Fedora Workstation 32)

Steps to reproduce

1. Run the following commands from the "Getting Started - Scenic v0.10.4 guide":
2. mix scenic.new.example my_app
3. cd my_app
4. mix do deps.get, scenic.run
5. Observe debug output in terminal and accompanying blank black Scenic window.

Expected Behavior

The Scenic window should produce a working example application and the terminal should at most show info or warn level output.

Actual Behavior

No application is visible in Scenic window and a rapidly recurring error message and stack trace is shown in the terminal.

Stack Trace

%UndefinedFunctionError{arity: 1, function: :from_binary, message: nil, module: FontMetrics, reason: nil}
-->     (font_metrics 0.5.1) FontMetrics.from_binary(<<61, 145, 193, 107, 19, 65, 20, 198, 119, 187, 19, 76, 78, 213, 255, 160, 224, 65, 80, 18, 90, 109, 106, 10, 34, 162, 88, 83, 74, 138, 132, 22, 241, 32, 227, 102, 243, 54, 14, 238, 206, 44, 51, 179, 37, 61, 107, 75, 211, 150, ...>>)
    (scenic 0.10.4) lib/scenic/cache/static/font_metrics.ex:226: Scenic.Cache.Static.FontMetrics.load/3
    (scenic 0.10.4) lib/scenic/cache/static/font_metrics.ex:154: Scenic.Cache.Static.FontMetrics.get/2
    (scenic 0.10.4) lib/scenic/scenes/error.ex:44: Scenic.Scenes.Error.init/2
    (scenic 0.10.4) lib/scenic/scene.ex:882: Scenic.Scene.handle_continue/2
    (stdlib 3.14) gen_server.erl:689: :gen_server.try_dispatch/4
    (stdlib 3.14) gen_server.erl:431: :gen_server.loop/7
    (stdlib 3.14) proc_lib.erl:226: :proc_lib.init_p_do_apply/3

[axelson]

I think this is fixed by #219, it just hasn't been released on hex yet.

[skovsgaard]

Seems like it. Pardon my missing that. I'll just close this issue.