T11627: Improve KIO asynchronicity

[Méven Car]

meven updated the task description.

TASK DETAIL
  https://phabricator.kde.org/T11627

To: meven
Cc: broulik, ognarb, #dolphin, #frameworks, meven, dfaure, pberestov, iasensio, fprice, LeGast00n, MrPepe, fbampaloukas, alexde, GB_2, Codezela, feverfew, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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