patch 8.1.0796: MS-Windows 7: problem with named pipe on channel

Problem:    MS-Windows 7: problem with named pipe on channel.
Solution:   Put back the disconnect/connect calls. (Yasuhiro Matsumoto,
            closes #3833)

src/channel.c

@@ -3181,7 +3181,13 @@ channel_wait(channel_T *channel, sock_T fd, int timeout)
 
 	    if (r && nread > 0)
 		return CW_READY;
-	    if (r == 0)
+
+	    if (channel->ch_named_pipe)
+	    {
+		DisconnectNamedPipe((HANDLE)fd);
+		ConnectNamedPipe((HANDLE)fd, NULL);
+	    }
+	    else if (r == 0)
 		return CW_ERROR;
 
 	    /* perhaps write some buffer lines */
@@ -3813,7 +3819,16 @@ channel_send(
 	if (part == PART_SOCK)
 	    res = sock_write(fd, (char *)buf, len);
 	else
+	{
 	    res = fd_write(fd, (char *)buf, len);
+#ifdef WIN32
+	    if (channel->ch_named_pipe && res < 0)
+	    {
+		DisconnectNamedPipe((HANDLE)fd);
+		ConnectNamedPipe((HANDLE)fd, NULL);
+	    }
+#endif
+	}
 	if (res < 0 && (errno == EWOULDBLOCK
 #ifdef EAGAIN
 			|| errno == EAGAIN

src/testdir/test_terminal.vim

@@ -644,8 +644,7 @@ endfunc
 
 func Test_terminal_no_cmd()
   " Does not work on Mac.
-  " Todo: make this work on Win32 again
-  if has('mac') || has('win32')
+  if has('mac')
     return
   endif
   let buf = term_start('NONE', {})

src/version.c

@@ -791,6 +791,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    796,
 /**/
     795,
 /**/