[Vm-dev] Latest VM "tears" screen

[Max Leske]

Hi Alistair,


>
> Hi Everyone,
>
> I've just rebuilt my vmmaker squeak image and found that dragging
> windows around "tears" the windows underneath, as shown in the
> attached image.  Bringing the damaged window to the front causes the
> contents to be redrawn correctly.
>
> I also saw this when building a pharo vm a couple of days ago.  It
> causes tests in PNGReadWriterTest class to fail (#test2BitReversed,
> #test4BitReversed and #test8BitReversed from memory).
>
> I'm guessing the change was made in the last 6 weeks or so.
>
> If no one recognises this I'll start looking at it in a few days (I 
> hope).

I'v seen this today on macOS 10.14 (Mojave). I didn't think anything of 
it because since Mojave I can't run any of my old VM's properly due to a 
problem that looks very similar but doesn't go away unless I resize the 
image window, which I obviously can't do after every click. Also, the 
tearing effect in the old VM's is much worse.

I'm pretty sure the two issues aren't directly related but I thought I'd 
put it out there, just in case.

Max

>
> Thanks,
> Alistair
>
>
> $ sqlinux.201809301616/squeak --version
> 5.0-201809301616  Sun Sep 30 16:24:40 UTC 2018 gcc 4.8 [Production
> Spur 64-bit VM]
> CoInterpreter VMMaker.oscog-eem.2437 uuid:
> 0e97c106-dd0b-437b-b1aa-e15257288c3f Sep 30 2018
> StackToRegisterMappingCogit VMMaker.oscog-eem.2432 uuid:
> 7b14d114-0e04-4e46-b8a7-4b5e6d87f5fe Sep 30 2018
> VM: 201809301616 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
> Date: Sun Sep 30 09:16:55 2018 CommitHash: 057c592
> Plugins: 201809301616 
> https://github.com/OpenSmalltalk/opensmalltalk-vm.git
> Linux travis-job-0b521285-dae6-496e-a96c-06870f88a3a5
> 4.4.0-101-generic #124~14.04.1-Ubuntu SMP Fri Nov 10 19:05:36 UTC 2017
> x86_64 x86_64 x86_64 GNU/Linux
> plugin path: sqlinux.201809301616/lib/squeak/5.0-201809301616
> [default: 
> /home/alistair/vmmaker/opensmalltalk-vm/image20181001/sqlinux.201809301616/lib/squeak/5.0-201809301616/]
>
> OS: Ubuntu 16.04