List manipulation, e.g., removal of quickfix entries.

[gregorias]

Is it possible to delete entries from an existing list like the quickfix list? With the native quickfix window, I was able to configure dd to remove entries like so:

" When using `dd` in the quickfix list, remove the item from the quickfix list.
function! quickfixdd#RemoveQFItem() abort
  let l:qf_list = getqflist()

  if len(l:qf_list) > 0
    let l:curqfidx = line('.') - 1
    call remove(l:qf_list, l:curqfidx)
    call setqflist(l:qf_list, 'r')
  endif

  if len(l:qf_list) > 0
    execute l:curqfidx + 1 . 'cfirst'
    copen
  else
    cclose
  endif
endfunction

It would be cool if Trouble could also do that.