D18877: Optimize Baloo::File copy assign operator, fix Baloo::File::load(url)

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, Frameworks, ngraham, poboiko.
Herald added projects: Frameworks, Baloo.
Herald added a subscriber: kde-frameworks-devel.
bruns requested review of this revision.

REVISION SUMMARY
  There is no need to delete and create a new Private on assignment, it is
  sufficient to reassign its members.
  
  File::load(url) resets the url, afterwards he old corresponding property
  map is no longer valid, clear it.

TEST PLAN
  ctest

REPOSITORY
  R293 Baloo

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18877

AFFECTED FILES
  src/lib/file.cpp

To: bruns, #baloo, #frameworks, ngraham, poboiko
Cc: kde-frameworks-devel, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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