D26033: feat: add Control file watcher

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: Plasma.
Herald added a project: Plasma.
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REVISION SUMMARY
  A simple QFileSystemWatcher is added to Control objects that can be activated
  on demand.
  
  On change the Control::changed signal is emitted.

TEST PLAN
  Compiles.

REPOSITORY
  R104 KScreen

BRANCH
  control-filewatcher

REVISION DETAIL
  https://phabricator.kde.org/D26033

AFFECTED FILES
  common/control.cpp
  common/control.h

To: romangg, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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