https://git.ruby-lang.org/ruby.git/commit/?id=d9ccb6b372

From d9ccb6b372f830fe4aab89460bb4b6147cfd924f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 5 Feb 2022 18:18:48 +0900
Subject: [ruby/reline] Check the ambiguous char width only on tty

It sent the char to check even to non-tty, e.g., pipe.
This causes `unknown command: "\xE2\x96\xBDstart ` warnings on
ruby's parallel test on Windows, where non-standard FDs cannot be
passed to child processes.

https://github.com/ruby/reline/commit/0d373647fb
---
 lib/reline.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/reline.rb b/lib/reline.rb
index a9fc49b416..a57b570544 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -466,7 +466,7 @@ module Reline https://github.com/ruby/ruby/blob/trunk/lib/reline.rb#L466
     end
 
     private def may_req_ambiguous_char_width
-      @ambiguous_width = 2 if Reline::IOGate == Reline::GeneralIO or STDOUT.is_a?(File)
+      @ambiguous_width = 2 if Reline::IOGate == Reline::GeneralIO or !STDOUT.tty?
       return if defined? @ambiguous_width
       Reline::IOGate.move_cursor_column(0)
       begin
-- 
cgit v1.2.1


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