If columns are removed and we get notified via layoutChanged, the code
tries to restore old section sizes, and went out of bounds, leading to
an assert in QVector. Simply add an if() to skip restoring out-of-bounds columns.
This comes from https://bugs.kde.org/show_bug.cgi?id=395181,
which translates into the unittest that is part of this commit.
Change-Id: Ide42176a758f87b21957c40508127d67f1d5a2d9
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
ba6e0e4aac