refresh_keywords question about asyncomplete-buffer.vim HOT 1 OPEN

I've done a bit more digging, and I think I figured out why performance is so slow on large buffers.

This line:
https://github.com/prabirshrestha/asyncomplete-buffer.vim/blob/master/autoload/asyncomplete/sources/buffer.vim#L56

I think the objects are never equal due to the cursor positions and line numbers getting updated on cursor move.

I am not sure the proper fix here, however It looks like something along the lines of comparing the changedtick would be the correct solution? If this is the case, I would be happy to submit a PR for it, just not sure if that's the right fix.

    if a:event == 'TextChangedI'
        call s:refresh_keyword_incr(a:ctx['typed'])
    else
        if s:last_ctx['changedtick'] == a:ctx['changedtick']
            return
        endif
        let s:last_ctx = a:ctx
        call s:refresh_keywords()
    endif

from asyncomplete-buffer.vim.