Modal QDialog events 'stall' until window is moved

[high_flyer]

Oh... and again... all of this same code worked fine prior to our update from 4.8 to 5.6.1

Could be a Qt bug if you code didn't change.

Is there a reason you are bound to 5.6.1 and can't try a newer version?
(If it is a Qt bug, it might have been resolved since then)

[TuffLove]

OK. I fixed the issue. It may point to a Qt bug, or a documentation issue.

Again, in my situation I am hosting a QWidget in a VST plugin... so the host is NOT Qt. My system needs to be "polled" often to do various things. We handle this by creating a simple little class we call Poller, which is derived from QObject. The Poller, in its constructor, starts a timer. In the timer callback we call our system poll functions. In our DllMain function, we instantiate one of these Pollers.

OK... so... we have always started the timer with an argument of 0. The docs say...

A timer event will occur every interval milliseconds until killTimer() is called. If interval is 0, then the timer event occurs once every time there are no more window system events to process.

Again this always worked in the past.

So now that we are using 5.6, setting the timer to 0 gives the bad behavior described above, but setting it to 1 makes everything work again.