[newlib-cygwin] Cygwin: pty: Fix console mode of non-cygwin apps in background.

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d593c3e17ea1c614ddf37ff61e6d382d81a343d7

commit d593c3e17ea1c614ddf37ff61e6d382d81a343d7
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Sun Dec 12 21:24:15 2021 +0900

    Cygwin: pty: Fix console mode of non-cygwin apps in background.
    
    - If the non-cygwin app is started in the background in pseudo
      console, the console mode is broken for the app. This patch fixes
      the issue.

Diff:
---
 winsup/cygwin/fhandler_tty.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 37e27f34a..7b18a15e7 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -3384,7 +3384,7 @@ skip_create:
   if (get_ttyp ()->previous_output_code_page)
     SetConsoleOutputCP (get_ttyp ()->previous_output_code_page);
 
-  do
+  if (get_ttyp ()->getpgid () == myself->pgid)
     {
       termios &t = get_ttyp ()->ti;
       DWORD mode;
@@ -3409,7 +3409,6 @@ skip_create:
 	mode |= DISABLE_NEWLINE_AUTO_RETURN;
       SetConsoleMode (hpConOut, mode);
     }
-  while (false);
 
   return true;