Call off start_child when the group leader terminates

[jonatanklosko]

Example

defmodule Slow do
  use GenServer

  def start_link(time) do
    GenServer.start_link(__MODULE__, time, name: __MODULE__)
  end

  def init(time) do
    Process.sleep(time)
    {:ok, time}
  end
end

Kino.start_child({Slow, 10_000})

When we "Evaluate" and "Stop" (which terminates the evaluator), the child still ends up starting. Consequently, if we try to evaluate again (which starts a new evaluator), we get :already_started, because the process is still under the kino supervision tree.

[hugobarauna]

we get :already_started

I got this yesterday while starting a FLAME Pool. Felt weird, but it worked at the end.

Maybe it was related to this bug. If yes, hopefully fixed now. 😊