fix(vim): use lewis6991/gitsigns.nvim instead of airblade/vim-gitgutter for better performance

.vimrc

@@ -51,7 +51,7 @@ set ttimeoutlen=0
 set wildmenu
 set wildoptions=fuzzy,pum
 if has('nvim')
-    set signcolumn=yes:2
+    " set signcolumn=yes:2
     " set cmdheight=0
     set pumblend=40
     set winblend=40
@@ -114,12 +114,18 @@ Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
 Plug 'junegunn/fzf.vim'
 Plug 'rhysd/conflict-marker.vim'
 Plug 'ryanoasis/vim-devicons'
-Plug 'airblade/vim-gitgutter'
+" this plugin slows vim down when dealing
+" with large files, so I switch to the Nvim version
+" Plug 'airblade/vim-gitgutter'
+if has('nvim')
+    Plug 'lewis6991/gitsigns.nvim'
+endif
 Plug 'tpope/vim-fugitive'
 Plug 'Yggdroot/indentLine'
 Plug '907th/vim-auto-save'
 Plug 'markonm/traces.vim'
 Plug 'stevearc/oil.nvim'
+Plug 'vim-scripts/LargeFile'
 
 call plug#end()
 
@@ -328,6 +334,10 @@ let g:airline_left_alt_sep = ''
 let g:airline_right_sep = ''
 let g:airline_right_alt_sep = ''
 
+if has('nvim')
+    lua require('gitsigns').setup()
+endif
+
 " fix c++ comment style in Neovim
 " ref: https://github.com/tpope/vim-commentary/issues/15#issuecomment-23127749
 autocmd FileType c,cpp,cs,java setlocal commentstring=//\ %s

home-manager/home.nix

@@ -411,7 +411,7 @@ in {
       # This may not apply. Also try `git config --global gpg.ssh.program "/home/user/.nix-profile/bin/op-ssh-sign"`
       # gpg."ssh".program = "${unstable._1password-gui}/bin/op-ssh-sign";
       push.autoSetupRemote = true;
-      core.editor = "vim";
+      core.editor = "nvim";
     };
   };