[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Mac OS regression: freeze image with two-finger-scroll using touchpad (#302)

[f4lco]

I reproducibly encounter image freezes using two-finger scroll on Mac OS using version

> 5.0 5.0.201810270242 Mac OS X built on Oct 27 2018 02:46:13 UTC Compiler: 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31) [Production Spur 64-bit VM]
CoInterpreter VMMaker.oscog-eem.2461 uuid: b3cd33f5-6309-43a1-b669-7a1805111f34 Oct 27 2018
StackToRegisterMappingCogit VMMaker.oscog-eem.2464 uuid: 0b1fa0a3-a781-4fd5-b1cf-1809796ccbbf Oct 27 2018
VM: 201810270242 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Date: Fri Oct 26 19:42:18 2018 CommitHash: df9064a
Plugins: 201810270242 https://github.com/OpenSmalltalk/opensmalltalk-vm.git

when, however, the following version is fine:

> 5.0 5.0.201810190412 Mac OS X built on Oct 20 2018 08:16:09 UTC Compiler: 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31) [Production Spur 64-bit VM]
CoInterpreter VMMaker.oscog-eem.2461 uuid: b3cd33f5-6309-43a1-b669-7a1805111f34 Oct 20 2018
StackToRegisterMappingCogit VMMaker.oscog-eem.2464 uuid: 0b1fa0a3-a781-4fd5-b1cf-1809796ccbbf Oct 20 2018
VM: 201810190412 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Date: Thu Oct 18 21:12:21 2018 CommitHash: 15341b5
Plugins: 201810190412 https://github.com/OpenSmalltalk/opensmalltalk-vm.git

I've attached a screencast of what I did. At first one can see that the image I opened is in principle functional, that is, window decoration lights up on mouse-over, list items highlight when hovered, and clicks on list items work as expected (screen recording tool adds extra highlight to clicks). All of this happens using an external mouse. Around the ten second mark I  switch to the MacBook touchpad and attempt a two-finger scroll. Suddenly all of the mentioned behaviors stop working, as if input was completely stalled. It is probably not a complete image freeze, because the frame counter still appears to be operational. However, I'm not even able to close the image using the red button.

![screen recording 2018-11-07 at 14 19 54](https://user-images.githubusercontent.com/29141485/48135100-36fb1400-e29c-11e8-88d7-2f8791592886.gif)



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