[Stable-8.2.7 13/53] chardev/char-win-stdio.c: restore old console mode

[Michael Tokarev]

From: songziming <s.ziming@hotmail.com>

If I use `-serial stdio` on Windows, after QEMU exits, the terminal
could not handle arrow keys and tab any more. Because stdio backend
on Windows sets console mode to virtual terminal input when starts,
but does not restore the old mode when finalize.

This small patch saves the old console mode and set it back.

Signed-off-by: Ziming Song <s.ziming@hotmail.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: 
<ME3P282MB25488BE7C39BF0C35CD0DA5D8CA82@ME3P282MB2548.AUSP282.PROD.OUTLOOK.COM>
(cherry picked from commit 903cc9e1173e0778caa50871e8275c898770c690)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/chardev/char-win-stdio.c b/chardev/char-win-stdio.c
index 1a18999e78..13325ca967 100644
--- a/chardev/char-win-stdio.c
+++ b/chardev/char-win-stdio.c
@@ -33,6 +33,7 @@
 struct WinStdioChardev {
     Chardev parent;
     HANDLE  hStdIn;
+    DWORD   dwOldMode;
     HANDLE  hInputReadyEvent;
     HANDLE  hInputDoneEvent;
     HANDLE  hInputThread;
@@ -159,6 +160,7 @@ static void qemu_chr_open_stdio(Chardev *chr,
     }
 
     is_console = GetConsoleMode(stdio->hStdIn, &dwMode) != 0;
+    stdio->dwOldMode = dwMode;
 
     if (is_console) {
         if (qemu_add_wait_object(stdio->hStdIn,
@@ -221,6 +223,9 @@ static void char_win_stdio_finalize(Object *obj)
 {
     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(obj);
 
+    if (stdio->hStdIn != INVALID_HANDLE_VALUE) {
+        SetConsoleMode(stdio->hStdIn, stdio->dwOldMode);
+    }
     if (stdio->hInputReadyEvent != INVALID_HANDLE_VALUE) {
         CloseHandle(stdio->hInputReadyEvent);
     }
-- 
2.39.2