D26466: Update KPluginSelector to allow KCM to show good state for reset, apply and default button

[Benjamin Port]

bport created this revision.
bport added reviewers: Plasma, ervin, crossi, meven.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
bport requested review of this revision.

REVISION SUMMARY
  - emit changed with good value to ensure reset button is activated only when needed
  - add defaulted signal to activate dafault button only when needed

REPOSITORY
  R295 KCMUtils

REVISION DETAIL
  https://phabricator.kde.org/D26466

AFFECTED FILES
  src/kpluginselector.cpp
  src/kpluginselector.h
  src/kpluginselector_p.h

To: bport, #plasma, ervin, crossi, meven
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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