[ruby-core:30550] Re: tk doesn't startup well in doze

Interesting.
With 1.9.1

#  module TkCore; RUN_EVENTLOOP_ON_MAIN_THREAD = true; end

That line causes no mystery background window, and things work as expected.

> -------------------------------------------------------------
>  module TkCore; RUN_EVENTLOOP_ON_MAIN_THREAD = false; end
> -------------------------------------------------------------

That line appears to have no effect (runs as normal, i.e. mystery
window, hang on exit).

With 1.9.3 I now get this (exits fine, with mystery window, but
running an app yields:)

irb(main):009:0> Tk.mainloop
RuntimeError: can't unset "__initail_state_of_rubytk__": no such variable

HTH.
-rp