This only occurred if the item added was the only item in the last
row/column, since then the the internal grid failed to expand
(in this case it would always call expand(0, 0), which would not
create the extra row/column).
[ChangeLog][QtWidgets][QGridLayout] Fixed crash that sometimes happened
when adding items with spans that spanned to the bottom/right edge.
Task-number: QTBUG-38052
Change-Id: Iba95f6d9d9356b4d1c84c7b93f4af9b4ea0cf714
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>
3ab6653d97