Comment 6 for bug 2047021

I can reproduce that now on Ubuntu 23.10, but it doesn't appear on macOS. I think the libadwaita MessageDialog rearranges itself into a vertical layout if it thinks the dialog will be too wide (around 550px from looking through the source code)

I don't think we can control this in general (e.g. translations which might be much longer), but we could change the default string to something shorter like "Don't expand canvas"