Because they would break communication (or loop infinitely) otherwise since we use the presence of bytes in the returned buffer to know if there is still something we need to transmit. Amends 4e60a6b556d91ab797aebb7422666a685a726755 Change-Id: If72c1a142d4567f69d78177250b0218c5ca999fd Reviewed-by: Even Oscar Andersen <even.oscar.andersen@qt.io> Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io> (cherry picked from commit 1efcc0df6adab11e7239f5f12a13766a58e2c1ea) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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