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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Core dumps in redisplay.
Date: Sun, 27 Feb 2005 08:43:07 -0500
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      /* Unblock input if we enter with input blocked.  This may happen if
	 redisplay traps e.g. during tool-bar update with input blocked.  */
      while (INPUT_BLOCKED_P)
	UNBLOCK_INPUT;

      return Fthrow (Qtop_level, Qnil);
    }

    This approach of unblocking input appears completely useless to me,
    since unwinding the stack includes restoration of
    interrupt_input_blocked.

Probably that code was needed in the past,
before unwind_to_catch did this.  I will try deleting it.