So gitgutter diff column appear in my NERDTree buffer whether I have option:
let g:gitgutter_sign_column_always = 1
enabled or disabled.
Sometimes it doesn't appear at start but after I switch between tree and file buffer few times, it appears.
My .vimrc can be found here.
Any idea of how to fix this?
I don't know what exacly causes this issue but i worked it around using:
let g:gitgutter_eager = 0
which disables signs updates when buffer/tab is switched.