nvim: Improve completino menu, add cursor context

Improved completion menu by allowing c-p,c-n scrolling through it.

Removed automatically resizing buffers, use c-w= if you need it.

Added scrolloff, controlling the amount of lines that are always
under/above the cursor. This fixes the cursor being at the very bottom
of the page, after doing e.g. zb or zt and will allow seeing a bit more
information around it at all times.

nvim/.config/nvim/init.vim

@@ -168,6 +168,29 @@ au BufNewFile,BufRead /dev/shm/pass.?*/?*.txt setlocal noswapfile nobackup nound
 au BufNewFile,BufRead $TMPDIR/pass.?*/?*.txt setlocal noswapfile nobackup noundofile nowritebackup viminfo=
 au BufNewFile,BufRead /tmp/pass.?*/?*.txt setlocal noswapfile nobackup noundofile nowritebackup viminfo=
 
+" from https://github.com/tjdevries/config_manager/blob/master/xdg_config/nvim/init.vim
+if has('nvim-0.4')
+  " make completion menu slightly transparent
+  set pumblend=17
+  set wildmode=longest:full
+
+  " Makes floating PopUpMenu for completing stuff on the command line.
+  "     Very similar to completing in insert mode.
+  set wildoptions+=pum
+else
+  set wildmode=longest,list,full
+  " Vim Galore recommended mappings
+  " Make next and previous use smart history
+  cnoremap <C-N> <Up>
+  cnoremap <C-P> <Down>
+end
+
+" turn of automatic resizing of individual splits
+set noequalalways
+
+" make sure there's always *some* context below cursor
+set scrolloff=5
+
 " }}}
 " KEYBINDINGS {{{
 " ================================================================================