/ curl Public
multi: remove PENDING + MSGSENT handles from the main linked list #10801
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As they are not driving transfers or any socket activity, the main loop does not need to iterate over these handles. A performance improvement.
They are instead only held in their own separate lists.
'data->multi' is kept a pointer to the multi handle as long as the easy handle is actually part of it even when the handle is moved to the pending/msgsent lists. ->multi gets cleared by curl_multi_cleanup() which "orphans" all previously attached easy handles.
This is take 2. The first version was reverted for the 8.0.1 release.
Assisted-by: Stefan Eissing