updated for version 7.3.023

Problem:    External program may hang when it tries to write to the tty.
Solution:   Don't close the slave tty until after the child exits. (Nikola
            Knezevic)

src/os_unix.c

@@ -4168,7 +4168,6 @@ mch_call_shell(cmd, options)
 # ifdef FEAT_GUI
 		if (pty_master_fd >= 0)
 		{
-		    close(pty_slave_fd);	/* close slave side of pty */
 		    fromshell_fd = pty_master_fd;
 		    toshell_fd = dup(pty_master_fd);
 		}
@@ -4637,6 +4636,14 @@ finished:
 		    break;
 	    }
 
+# ifdef FEAT_GUI
+	    /* Close slave side of pty.  Only do this after the child has
+	     * exited, otherwise the child may hang when it tries to write on
+	     * the pty. */
+	    if (pty_master_fd >= 0)
+		close(pty_slave_fd);
+# endif
+
 	    /* Make sure the child that writes to the external program is
 	     * dead. */
 	    if (wpid > 0)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    23,
 /**/
     22,
 /**/