Tim Jenssen authored Jun 26, 2017 and Tobias Hunger committed Jun 26, 2017

Fix a crash when using file nodes to change the project. The methods used
to take const references, with the data living in the nodes of the project
tree. Since the methods change the project tree and thus cause the tree to
be rebuilt, the original data may get lost. So copy the data instead.

All the qbs::*Data classes are using shared data, so the overhead is not
too big.

Task-number: QTCREATORBUG-18440
Change-Id: I45ca5403a04e17790416dfe15b836f12c732e824
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>