When items are added into multiple categories, we got into a double
delete when cleaning up, e.g. when changing the shown examples to a
different Qt version.
Sort copies into categories and delete the originals as a quickfix.
Cleaner would be if we didn't allocate them on the heap in the first
place.
Fixes: QTCREATORBUG-29197
Change-Id: I6490111aba87335b0f7189c4957ed1da8681806f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
dd1a69e05f