I am developing a top/htop clone in Qt supposed to display the processes on a remote device. A fresh list of processes is transmitted every second and causes the internal QAbstractItemModel derivative representing the states in the client to update. This happens in a loop that uses two iterators (one for the old list and one for the fresh list) that I simultaneously iterate through to compare the entries and apply changes (i.e. remove/insert/update entries) if neccessary.
I would like to know if every beginInsertRows/beginRemoveRows call must be immediately followed by a closing endInsertRows/endRemoveRows call after the respective change or whether it is ok to have boolean flags indicating that indeed an insertion/removal has taken place and then carry on applying more insertions/removals and only at the end call endInsertRows/endRemoveRows once depending on the previously mentioned flags.
Since a potentially large number of entries in the model might have changed (in turn triggering a large number of insertions/removals) I am concerned with the performance and wouldn't like the model to notify the views for an update until I am done with all insertions/removals.
Is that possible or shouldn't I care about that because Qt already has some internal optimizations to automatically handle such cases which I am not aware of?
Edit 1: Empty rows followed by a crash seem to have answered the question as can be seen in this image.
