Neovim allows quickfix list to be populated in a variety of ways: grep,
lsp symbol references etc. Being able to add files in the quickfix
window to the LLM chat context allows for interesting workflows. For
example, one could search for a symbol using the LSP integration,
populate the quickfix with that list and then pass those along as
context in Avante using @quickfix mention in the sidebar.
If there are no files in the quickfix list or the items do not have a
file, nothing is added to the context.