https://git.ruby-lang.org/ruby.git/commit/?id=2c415cda85

From 2c415cda854ab02f8341428b5346a115d3648a48 Mon Sep 17 00:00:00 2001
From: YO4 <ysno@a...>
Date: Sat, 11 Dec 2021 23:04:38 +0900
Subject: [ruby/reline] windows improve scrolling

ScrollConsoleScreenBuffer can't scroll window of Windows Terminal.
Use LF to sctoll.

Microsoft says
```In the virtual terminal sequences world, the size of the window and the size of the screen buffer are fixed to the same value.
```
https://docs.microsoft.com/en-us/windows/console/window-and-screen-buffer-size

https://github.com/ruby/reline/commit/9ff3c70732
---
 lib/reline/windows.rb | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/lib/reline/windows.rb b/lib/reline/windows.rb
index 15bc88aec3d..23bbd087a45 100644
--- a/lib/reline/windows.rb
+++ b/lib/reline/windows.rb
@@ -168,6 +168,8 @@ class Reline::Windows https://github.com/ruby/ruby/blob/trunk/lib/reline/windows.rb#L168
   @@input_buf = []
   @@output_buf = []
 
+  @@output = STDOUT
+
   def self.msys_tty?(io=@@hConsoleInputHandle)
     # check if fd is a pipe
     if @@GetFileType.call(io) != FILE_TYPE_PIPE
@@ -370,13 +372,21 @@ class Reline::Windows https://github.com/ruby/ruby/blob/trunk/lib/reline/windows.rb#L372
   end
 
   def self.scroll_down(val)
-    return if val.zero?
-    screen_height = get_screen_size.first
-    val = screen_height - 1 if val > (screen_height - 1)
-    scroll_rectangle = [0, val, get_screen_size.last, get_screen_size.first].pack('s4')
-    destination_origin = 0 # y * 65536 + x
-    fill = [' '.ord, 0].pack('SS')
-    @@ScrollConsoleScreenBuffer.call(@@hConsoleHandle, scroll_rectangle, nil, destination_origin, fill)
+    return if val < 0
+
+    csbi = 0.chr * 22
+    @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi)
+    x, y, left, top, screen_height = csbi.unpack 'x4ssx2ssx2s'
+
+    origin_x = x - left + 1
+    origin_y = y - top + 1
+    screen_height += 1
+    val = screen_height if val > screen_height
+    @@output.write [
+      (origin_y != screen_height) ? "\e[#{screen_height};H" : nil,
+      "\n" * val,
+      (origin_y != screen_height or !origin_x.zero?) ? "\e[#{origin_y};#{origin_x}H" : nil
+    ].join
   end
 
   def self.clear_screen
-- 
cgit v1.2.1


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