OK I finally managed to get fully working and will post here in case anyone is
interested, just put the code in vimrc and you can quickly invoke help in the
current window by pressing <leader>h:
function! OpenHelpInCurrentWindow(topic)
view $VIMRUNTIME/doc/help.txt
setl filetype=help
setl buftype=help
setl nomodifiable
exe 'keepjumps help ' . a:topic
endfunction
command! -nargs=? -complete=help Help call OpenHelpInCurrentWindow(<q-args>)
nnoremap <silent> <leader>h :view +1 $VIMRUNTIME/doc/help.txt
Thanks for everyone's tips
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