D26040: [KCM/Effects] Allow the user to know when the settings are set to default

meven created this revision.
meven added reviewers: KWin, crossi, ervin.
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REVISION SUMMARY
  It works for the effect

TEST PLAN
  kcmshell5 kcm_kwin_effects
  Change some settings, the "Restore defaults" button is enabled when the state is not the default state.
  Open an effect configuration, the "Restore defaults" button is enabled when the settings are not default.

REPOSITORY
  R108 KWin

BRANCH
  kcm-effects-isDefault

REVISION DETAIL
  https://phabricator.kde.org/D26040

AFFECTED FILES
  kcmkwin/common/effectsmodel.cpp
  kcmkwin/common/effectsmodel.h
  kcmkwin/kwineffects/kcm.cpp

To: meven, #kwin, crossi, ervin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart