A QAbstractSocket can be close()'d at any time, independently of its
current connection state. being closed means that we cannot use it to
read or write data, but internally it might still have some data to
send or receive, for example to an http server. We can even get a
connected() signal after close()'ing the socket.
We need to catch this condition and mark any pending data not yet
written to the socket for resending.
Task-number: QTBUG-48326
Change-Id: I6f61c35f2c567f2a138f8cfe9ade7fd1ec039be6
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
0df5d07929