D11518: Use model reset rather than beginRemoveRows() to clear font groups

[Daniel Vrátil]

dvratil created this revision.
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Restricted Application added a subscriber: plasma-devel.
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REVISION SUMMARY
  Calling beginRemoveRows() when the model is empty hits an assert in
  QAbstractItemModel which requires that the "last" argument is less
  than model row count, which is not true when the model is empty.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11518

AFFECTED FILES
  kcms/kfontinst/kcmfontinst/GroupList.cpp

To: dvratil
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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