[Interest] What is beginInsertRows() purpose?

[Etienne Sandré-Chardonnal]

I'm using this in Model/View classes for a while without any issue.

But... I always wondered why it is necessary to have both signals (one
before and one after) in the underlying mechanism, and what could be wrong
in doing:

-modify the model underlying data structure by inserting rows-
beginInsertRows()
endInsertRows()

Instead of the regular:
beginInsertRows()
-modify the model underlying data structure by inserting rows-
endInsertRows()


It's always better to understand why are things done how they are...

Thanks!

Etienne
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