D17238: Explicitly create QDateTime with UTC time

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: dfaure, davidedmundson.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Otherwise it spends half of the time doing timezone conversions to local time.

TEST PLAN
  - Copied a million files. Time spent in `QDateTime::setMSecsSinceEpoch` went from 44% to 0.1%, total time of `addCopyInfoFromUDSEnty` went from 57% to 36%, now the bottleneck is all that path concatenation causing URL decoding.
  - Verified that copied files still have correct mtime
  - Verified that "overwrite?" dialog still shows correct mtime

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D17238

AFFECTED FILES
  src/core/copyjob.cpp

To: broulik, dfaure, davidedmundson
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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