Re: Rendering regression in Gnus with gnus-treat-from-gravatar

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Wed, 15 Apr 2020 17:12:00 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Cc: asjo@koldfront.dk,  ding@gnus.org,  emacs-devel@gnu.org
    >> Date: Wed, 15 Apr 2020 15:54:09 +0200
    >> 
    >> >> Or itʼs the interaction with redisplay thatʼs slow
    >> 
    Eli> What interaction is that?
    >> 
    >> The url request fetches some image data, and inserts that in the Gnus
    >> article buffer. It won't get shown until redisplay runs, which means
    >> the main thread has to run.

    Eli> Assuming that the non-main thread exits once it's done fetching,
    Eli> that's not different from a single-threaded fetching, is it?  IOW,
    Eli> redisplay won't kick in until the code which fetches the images
    Eli> finishes.

True.

    >> Itʼs not yet clear to me from which thread that insertion eventually
    >> gets done

    Eli> The one that fetches the stuff, I suppose.  If not, how will the
    Eli> fetched stuff get passed to the main thread for insertion?

url-retrieve doesnʼt actually fetch anything, it adds a fetching
request to a work-queue, which then somehow actually causes a
fetch. I think I have a lot more code to read before I understand
everything thatʼs going on :-)

Robert