[newlib-cygwin] Cygwin: console: Fix IL/DL escape sequence on the last line.

[Takashi Yano <tyan0@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=96646006a7d9a4376255a25a2cbaad8502751c2a

commit 96646006a7d9a4376255a25a2cbaad8502751c2a
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Thu Feb 3 21:09:44 2022 +0900

    Cygwin: console: Fix IL/DL escape sequence on the last line.
    
    - Currently, escape sequence IL/DL (CSI Ps L, CSI Ps M) does not
      work correctly at the last (bottom end) line. This patch fixes
      the issue.
    
    Addresses:
      https://cygwin.com/pipermail/cygwin/2022-February/250736.html

Diff:
---
 winsup/cygwin/fhandler_console.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index 0e4b41559..fa5d7ce9c 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -2174,6 +2174,12 @@ fhandler_console::char_command (char c)
 	      cursor_get (&x, &y);
 	      if (y < srTop || y > srBottom)
 		break;
+	      if (y == con.b.srWindow.Bottom)
+		{
+		  WriteConsoleW (get_output_handle (), L"\033[2K", 4, 0, 0);
+		  wpbuf.empty ();
+		  break;
+		}
 	      if (y == con.b.srWindow.Top
 		  && srBottom == con.b.srWindow.Bottom)
 		{
@@ -2213,6 +2219,12 @@ fhandler_console::char_command (char c)
 	      cursor_get (&x, &y);
 	      if (y < srTop || y > srBottom)
 		break;
+	      if (y == con.b.srWindow.Bottom)
+		{
+		  WriteConsoleW (get_output_handle (), L"\033[2K", 4, 0, 0);
+		  wpbuf.empty ();
+		  break;
+		}
 	      __small_swprintf (bufw, L"\033[%d;%dr",
 				y + 1 - con.b.srWindow.Top,
 				srBottom + 1 - con.b.srWindow.Top);