D16392: [Config] Remove KDE4 config support, stop writing arbitrary config files

[Stefan Brüns]

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

REVISION SUMMARY
  The KDE4 baloofilerc was only used by dolphin in the KDE4 migration
  phase and is no longer needed.
  
  In case a baloofilerc in the legacy location does not exist, the effect
  is even worse - the KConfig is instantiated with an empty path, and the
  config file name is derived from the application name. This leads to
  adding a "[General]" section in e.g. kcmshell5rc or systemsettingsrc.

TEST PLAN
  modify config using `balooctl config {add,rm}` or using SystemSettings
  -> .config/baloorc resp. .config/systemsettingsrc is no longer written,
  only .config/baloofilerc.

REPOSITORY
  R293 Baloo

BRANCH
  excludes

REVISION DETAIL
  https://phabricator.kde.org/D16392

AFFECTED FILES
  src/lib/indexerconfig.cpp

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