Unresponsive UI in Wayland when multiple windows opened

[iNecas]

Steps to reproduce:

1. open window with a new world

GtWorld open

2. try to perform some action
3. the UI becomes unresponsive

Whe UI re-renders, when the windows are switched.

Run with:

 bin/GlamorousToolkit-cli --interactive --enable-wayland --beacon ERROR GlamorousToolkit.image

❯ ./bin/GlamorousToolkit --version
GlamorousToolkit v1.1.63 by feenk gmbh <contact@feenk.com> built on 2026-06-21

+-------------+--------------------------------------------------------------------------+
| Component   | Version                                                                  |
+========================================================================================+
| App         | v1.1.63 - Commit: 0a7156e2bf6d4c8fd1479d287a725d24e9611160               |
|-------------+--------------------------------------------------------------------------|
| App Builder | Commit: 32fd970519b9f9ffd0b0afb2db4b066f1e93566e                         |
|-------------+--------------------------------------------------------------------------|
| Pharo VM    | v10.3.9-46-gea9a2ea - Commit: ea9a2ea - Date: 2025-12-19 13:49:47 +01:00 |
+-------------+--------------------------------------------------------------------------+

The same behavior is observed when a debugger opens on exception.

The issue is not observed on X11.

Reproduced inside sway

[iNecas]

Additional observation: it happens only when only window is open (full-screen or one window across the screen)

[iNecas]

Workaround: turn the second window info floating in sway, so that all windows are visible.

[StephanEggermont]

Which OS and version?

[iNecas]

NixOS rolling release, rev 64c08a7ca051951c8eae34e3e3cb1e202fe36786.

[StephanEggermont]

Thanks for letting us know. Which library versions have the conflicting behavior?