qtbase/c27d2a57a441f9a1ce760e71635bd4c96882249d caused the code
to go through QStandardItemPrivate::setItemData() which does
not handle the special treatment of Qt::EditRole completely.
In the constructor of QStandardItemData; map Qt::EditRole to
Qt::DisplayRole to fix this as is done in setData().
Adapt the existing tst_QStandardItemModel::getSetItemData() to check
whether both roles are received in the dataChanged() signal.
Pick-to: 6.5
Fixes: QTBUG-112326
Change-Id: I133d058bacc3388c612c5b4fb18b54f5ef5cb56f
Reviewed-by: Samuel Gaist <samuel.gaist@idiap.ch>
Reviewed-by: David Faure <david.faure@kdab.com>
936fe007ee