https://git.ruby-lang.org/ruby.git/commit/?id=f793f68264

From f793f682641030da81a45f5a9a0f3191f79a75c2 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Fri, 3 Sep 2021 01:17:10 +0900
Subject: [ruby/irb] Add Alt+d trap from show doc dialog to show full doc

https://github.com/ruby/irb/commit/368327b082
---
 lib/irb/input-method.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index 9539163..915c8fd 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -314,11 +314,14 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/input-method.rb#L314
     end
 
     SHOW_DOC_DIALOG = ->() {
+      dialog.trap_key = nil
+      alt_d = 0xE4
       begin
         require 'rdoc'
       rescue LoadError
         return nil
       end
+
       if just_cursor_moving and completion_journey_data.nil?
         return nil
       end
@@ -328,6 +331,14 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/input-method.rb#L331
       name = IRB::InputCompletor.retrieve_completion_data(name, doc_namespace: true)
 
       driver = RDoc::RI::Driver.new
+
+      if key.combined_char == alt_d
+        begin
+          driver.display_names([name])
+        rescue RDoc::RI::Driver::NotFoundError
+        end
+      end
+
       begin
         name = driver.expand_name(name)
       rescue RDoc::RI::Driver::NotFoundError
@@ -358,6 +369,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/input-method.rb#L369
       width = 40
       formatter = RDoc::Markup::ToAnsi.new
       formatter.width = width
+      dialog.trap_key = alt_d
       contents = doc.accept(formatter).split("\n")
 
       x = cursor_pos_to_render.x + autocomplete_dialog.width
-- 
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