If we receive compressed data we will decompress it as it comes in,
in some cases the final byte we receive doesn't actually contribute
to the final output. If this byte is handled by itself then, when
combined with QNetworkReply's signal compression, we ended up not
emitting the readyRead signal for any of the data we received while
compressing the signals.
So, instead of relying on checking difference in bytes downloaded
for each batch of data received we keep track of how much data
we had received the last time we emitted readyRead.
Pick-to: 6.3 6.4 6.4.0
Fixes: QTBUG-106354
Change-Id: I4777be29b46bf0de968667e9de9d975c735ac6e6
Reviewed-by: Konrad Kujawa <konrad.kujawa@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
5387b88aa9