Calling detach() in setKey() will free the shared memory twice, if
we do not set m_memory to nullptr.
Clean cleanHandleInternal() does always return true, so
checking the value does not make sense.
We have to call cleanHandleInternal() immediately after the close.
Change-Id: I110693d1dd9dae4ff5e52cfd3fdd2f33137af969
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
QSharedMemory is using SVR4 shared memory for unix which is limited to
4 MB globally which is really hurting the performance for the designer.
POSIX shared memory is lifting some of this constraints but still has
some bugs on Max OS but generally works better.
Change-Id: I74c1ffd56495f408cd9340cd159190a1175a4086
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
