Hi,

So, I was able to reproduce your problem : for some reason, cairo does not answer a correct surface extent while in x11 (I didn't noticed before because I use wayland).
I can hack a solution (and I will), but have fear that will cause future problems :/ 
Anyway, I will commit a fix and you will be able to use the surface extent message.

Esteban

On May 25 2021, at 1:59 pm, kmo <voxkmp@gmail.com> wrote:
Here are details of X11, the Image and the VM

X11
-------

xdpyinfo | grep version
version number: 11.0
X.Org version: 1.20.9


Image
-----
/home/kmp/Pharo/images/gtkRoses/gtkRoses.image
Pharo9.0.0
Build information:
Pharo-9.0.0+build.1399.sha.9ae8329dedfbad7915b7b2cdc4accc7ce8109ce0 (64 Bit)
Unnamed

Virtual Machine
---------------
/home/kmp/Pharo/vms/90-x64-headless/lib/pharo
CoInterpreter VMMaker-tonel.1 uuid: 286e9806-8e7d-0d00-ab06-4e280faf8631 Apr
30 2021
StackToRegisterMappingCogit VMMaker-tonel.1 uuid:
286e9806-8e7d-0d00-ab06-4e280faf8631 Apr 30 2021
5125110 - Commit: 5125110 - Date: 2021-04-30 10:05:04 +0200

Pharo 9.0.0 built on Apr 30 2021 10:22:47 Compiler: 5.4.0 20160609
VMMaker versionString 5125110 - Commit: 5125110 - Date: 2021-04-30 10:05:04
+0200
CoInterpreter VMMaker-tonel.1 uuid: 286e9806-8e7d-0d00-ab06-4e280faf8631 Apr
30 2021
StackToRegisterMappingCogit VMMaker-tonel.1 uuid:
286e9806-8e7d-0d00-ab06-4e280faf8631 Apr 30 2021





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