[Vm-dev] Latest VM "tears" screen

Alistair Grant akgrant0710 at gmail.com
Mon Oct 1 19:15:09 UTC 2018

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).


$ 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
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