folding quickfix list based on the command which created it

I am trying to make a quickfix folding solution for my Vim config,
which does something different based on what command created the
quickfix list.

Currently, I'm folding all results from the same file together for the
various 'grep' commands, and I'm folding away all but errors and
warnings for compiler commands.

But I'm not happy with my detection of the command which created the
quickfix window.

I've tried using w:quickfix_title, but I have discovered this variable
does not get set until sometime after the filetype autocmd fires. So,
I've needed to set up my foldexpr to check the w:quickfix_title
variable every single time its invoked to determine which behavior to
use. Additionally, in order to apply the proper method initially, I
needed to create a BufWinEnter autocmd which will do :let
&foldexpr=&foldexpr to re-calculate all the folds on a quickfix
window, since the w:quickfix_title variable is not defined when the
filetype plugin fires.

So my first question is, is there a better way to detect the command
or command type which set the quickfix list?

My next problem, is that I use a couple plugins which set up the
quickfix list themselves, using the setqflist() function. For these
quickfix lists, w:quickfix_title is not set at all! And, I'm not
certain how a plugin could accomplish setting this variable, if after
setting the quickfix list in the plugin, the user just uses the
normal :copen, :cclose, etc. commands to manipulate the quickfix
window. I note that the w:quickfix_title variable is restored when
using :colder and :cnewer, so it has to be stored somewhere and
associated with the list it belongs to.

So my next question is, is there a way to associate a w:quickfix_title
with a given quickfix list created with the setqflist() function?

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