From 09d89af071e253aba92d3d765c51a2ac47fa6cce Mon Sep 17 00:00:00 2001
From: tompng <tomoyapenguin@gmail.com>
Date: Wed, 14 Aug 2024 02:54:05 +0900
Subject: [PATCH] Always use alternate sceen on alt-d

---
 lib/irb/input-method.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index f6b8d00e5..292fd716b 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -352,6 +352,10 @@ def show_doc_dialog_proc
         driver = input_method.rdoc_ri_driver
 
         if key.match?(dialog.name)
+          # easter_egg and RDoc::RI::Driver#display_names use pager internally.
+          # Some pager command like `more` doesn't use alternate screen
+          # so we need to turn on and off alternate screen manually.
+          print "\e[?1049h"
           if show_easter_egg
             IRB.__send__(:easter_egg)
           else
@@ -360,6 +364,7 @@ def show_doc_dialog_proc
             rescue RDoc::RI::Driver::NotFoundError
             end
           end
+          print "\e[?1049l"
         end
 
         begin