NERDTree does not dim off when I switch to it using :NERDTreeFind

In practice this means that when I use `NERDTreeFind` I do not see my cursorline in NERDTree buffer.

I was trying to work it around with some `BufEnter` autocmd, but I can not make it work.

**Workaround:**
Okay I managed to make it work with this code:
```viml
nnoremap <leader>f :NERDTreeFind<CR>zz:DimInactive<CR>
```
But I would like to make it less ugly and more universal.
