[Interest] Behaviour difference between Qt Version 5.4-0 and 5.5.1

[Günter Michel]

I notice a behaviour difference between Qt Version 5.4.0 and 5.5.1 in 
respect to network events.

My application communicates via QTcpSockets to a Qt Server Process using 
the same Qt Version.
While moving my 'Top Level Widget' ( QMainWindow or QDialog ) the 
'readyRead' Signal doesn't occure anymore, till I release the mouse in 
the titlebar.
The same thing happens, when resizing the window ( seams to be related 
to window manager frame events )
Timer events work, so the server gets  new requests.

On 5.4.0 'readyRead' Signal is delivered without problems. Qt 5.6. Beta 
has the same problem.

Is this a bug? Do yo know a workaround ?

Thanks in advance