[newlib-cygwin] Cygwin: pty: Prevent meaningless ResizePseudoConsole() calls.

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=b5089f339a2124f52dfe58c8e3c929e4c5634175

commit b5089f339a2124f52dfe58c8e3c929e4c5634175
Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Thu May 28 22:49:26 2020 +0900

    Cygwin: pty: Prevent meaningless ResizePseudoConsole() calls.
    
    - This patch prevents to call ResizePseudoConsole() unless the pty
      is resized.

Diff:
---
 winsup/cygwin/fhandler_tty.cc | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index f29a2c214..b091765b3 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -2615,18 +2615,18 @@ fhandler_pty_master::ioctl (unsigned int cmd, void *arg)
       *(struct winsize *) arg = get_ttyp ()->winsize;
       break;
     case TIOCSWINSZ:
-      /* FIXME: Pseudo console can be accessed via its handle
-	 only in the process which created it. What else can we do? */
-      if (get_pseudo_console () && get_ttyp ()->master_pid == myself->pid)
-	{
-	  COORD size;
-	  size.X = ((struct winsize *) arg)->ws_col;
-	  size.Y = ((struct winsize *) arg)->ws_row;
-	  ResizePseudoConsole (get_pseudo_console (), size);
-	}
       if (get_ttyp ()->winsize.ws_row != ((struct winsize *) arg)->ws_row
 	  || get_ttyp ()->winsize.ws_col != ((struct winsize *) arg)->ws_col)
 	{
+	  /* FIXME: Pseudo console can be accessed via its handle
+	     only in the process which created it. What else can we do? */
+	  if (get_pseudo_console () && get_ttyp ()->master_pid == myself->pid)
+	    {
+	      COORD size;
+	      size.X = ((struct winsize *) arg)->ws_col;
+	      size.Y = ((struct winsize *) arg)->ws_row;
+	      ResizePseudoConsole (get_pseudo_console (), size);
+	    }
 	  get_ttyp ()->winsize = *(struct winsize *) arg;
 	  get_ttyp ()->kill_pgrp (SIGWINCH);
 	}