D23460: Always periodically dispatch pending items

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  "Local" URLs can also be slow.
  This might jeopardize loading large local directories where a resorting could take place but imho it's better than leaving the user wondering when files will finally show up. However, it takes some time for `KDirLister` to initially signal items having been added, and only then our 2 second timer starts.
  Also, stop the timer when loading has completed.

TEST PLAN
  - Entered a very slow mount, got files to show up periodically. The first time it takes like five seconds but after that you get files in a steady 2 second pace

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D23460

AFFECTED FILES
  src/kitemviews/kfileitemmodel.cpp
  src/kitemviews/kfileitemmodel.h

To: broulik, #dolphin
Cc: kfm-devel, aprcela, vmarinescu, fprice, MrPepe, fbampaloukas, alexde, Codezela, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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