Rendering artifacts lead to false positive

[maartenbreddels]

Description

I'm seeing false positives, described at spacetelescope/jdaviz#543 (comment) . The capture of the output cells seems ok, but it seems to be capturing a part of the Jupyter Lab 3.0 interface (with different portions grey each time). I'm not sure this is a user bug or a Galata bug.

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[mbektas]

@maartenbreddels this is a bit surprising, cell output captures should have recorded only the output area. Can you try these:

• Can you make sure reference images are generated by GitHub Actions as described here?
• I checked the notebook tested, it seems to create an Application as cell output. Is it creating widget UI asynchronously in multiple steps? Is the cell output rendered after a noticeable wait? Are there multiple resizes happening before cell output is fully rendered? In that case adding a wait after cell execution could help. As the first line of onAfterCellRun function, you can try adding await galata.waitFor(2000); for example.
• Can I test this notebook in binder or similar web location?

[mbektas]

@maartenbreddels Galata had several updates since you reported this issue and recently the project was merged into JupyterLab core repository with this PR jupyterlab/jupyterlab#10796. Please test again with the latest Galata package and create an issue in https://github.com/jupyterlab/jupyterlab if problem persists.