Crashes when QML debugging is enabled

[timangus]

One thing I've noticed recently is that (presumably) changes in the QML debugger have started to cause crashes in qqsfpm. It seems that the debugger sometimes ends up (for whatever reason) in calling qqsfpm::data with an invalid index, which ultimately results in sourceModel() returning nullptr, and thus a nullptr de-reference. My fix is as follows, which is probably no bad thing anyway.

QVariant QQmlSortFilterProxyModel::data(const QModelIndex &index, int role) const
{
    if(!index.isValid())
        return {};

    return sourceData(mapToSource(index), role);
}

[oKcerG]

Thanks, I'll look into that

[timangus]

Or perhaps I should be using QAbstractItemModel::checkIndex()!

https://www.kdab.com/new-in-qt-5-11-improvements-to-the-model-view-apis-part-1/