The problem was that the span we stored in the multiCellMap was the
"effective" span (i.e. the given span subtracted with the number of
ignored rows it would span). Later we used that span to distribute its
size across all its cells. However, since the span now could be smaller
that the given span, we could sometimes fail to distribute to the last
span(s).
[ChangeLog][QtWidgets][layouts] Fixed a bug where spans sometimes didn't
distribute themselves to the last cells they covered.
Change-Id: I31db3d850484dc8b70d62c5f02f680740578c661
Task-number: QTBUG-43099
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>
c9db6e52bc