D21748: Replace the excludeRange mode setting when already available

[Bhushan Shah]

bshah created this revision.
bshah added a reviewer: fvogt.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
bshah requested review of this revision.

REVISION SUMMARY
  Instead of appending a new entry.
  
  BUG: 244857
  BUG: 408415

TEST PLAN
  - remove fonts.conf
  - start fonts kcm
  - enable exclude range
  - save
  - see config is added only once
  - modify config
  - save
  - see config is replaced and not added again
  - disable exclude range
  - save
  - see config is totally removed.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  bshah/fix-font-kcm

REVISION DETAIL
  https://phabricator.kde.org/D21748

AFFECTED FILES
  kcms/fonts/kxftconfig.cpp

To: bshah, fvogt
Cc: plasma-devel, LeGast00n, ericadams, jraleigh, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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