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QStandardItemModel::beginResetModel() and
QStandardItemModel::endResetModel() calls cannot be nested, and Qt will
produce warnings at runtime if such nesting is detected.
The nesting happened in two places:
1. QCMakeCacheModel::setViewType calls QCMakeCacheModel::setProperties.
Both called beginResetModel.
2. QCMakeCacheModel::setProperties calls QStandardItemModel::clear(),
which also calls beginResetModel.
The fix for 1 is to remove the {begin|end}ResetModel calls from
setViewType. The setProperties calls take care of the
{begin|end}ResetModel calls.
The fix for 2 is to replace the clear() call with a call that removes
all data rows.
Issue: #27376
