SendMessage doesn't send (with Fix)

[Ledjlale]

Hi
The Qt6's specs set -1 as a value of waitForReadyRead() : https://doc.qt.io/qt-6/qiodevice.html#waitForReadyRead

As for https://github.com/itay-grudev/SingleApplication/blob/master/singleapplication_p.cpp#L324
The msecs can be negative and different than -1 (coming from static_cast(msecs - time.elapsed()) )

The result is that at random, the function doesn't wait and return false. That lead to not send the message.

The proposition is to replace the call by :
bool result = socket->waitForReadyRead( msecs < 0 ? -1 : msecs );

Regards

[itay-grudev]

If you submit a PR for this I'll accept it, but the next time I have some free time I will probably focus it on the v4.0, which gets rid of QSharedMemory.

Technically it should also be affected by this issue, so I will probably have to make sure I consider the issue there as well.