[Development] Exception to source compatibility: adding AA_CompressHighFrequencyEvents flag

[Morten Sorvig]

> On 26 Apr 2016, at 14:08, Shawn Rutledge <Shawn.Rutledge at qt.io> wrote:
> 
> Personally I think event compression should be a cross-platform feature if we’re going to have it.  The event-pileup problem can happen also on Windows for example, but it seems that we never implemented event compression on any platform other than X11.  I’m not sure why.  But we don’t plan to do that in the 5.6 series, anyway.

For OS X: My first thought is that we should let the OS compress events for us. Which it does, at least for wheel events. Event compression in Qt can then be a feature for those platforms that need it (implemented in cross-platform code), but not mandatory.

Cheers,
Morten