vim-patch:7.4.693 #4172

Problem:    Session file is not correct when there are multiple tab pages.
Solution:   Reset the current window number for each tab page. (Jacob Niehus)

695baeefe1

---

see: "[patch] wincmd error during session restore"
     https://groups.google.com/d/msg/vim_dev/NykQ0UuOjXc/_MZi4sv9vp0J

What I did for testing:

```sh
mkdir /tmp/test_session
cd $_

function test_session() {
  $1 -u NONE -i NONE -N ~/.vimrc \
    -c 'wincmd s'      \
    -c 'wincmd v'      \
    -c 'wincmd T'      \
    -c 'normal 1gt'    \
    -c '2wincmd w'     \
    -c 'mks! test.vis' \
    -c 'qa'
  $1 -u NONE -i NONE -N -S test.vis
}

test_session vim
test_session nvim
test_session /path/to/your/neovim/repository/build/bin/nvim
```

src/nvim/version.c

@@ -595,7 +595,7 @@ static int included_patches[] = {
   696,
   695,
   694,
-  // 693,
+  693,
   // 692 NA
   // 691 NA
   690,