UI text invisible when using "dark" theme in Ubuntu 20.04 LTS

[ElGrafo]

As the title says, almost all text in the main window is invisible when using the dark mode (in the "Appearance" settings in Ubuntu, set "Window colors" to Dark) of Ubuntu 20.04 (tested with 1.24-beta3). That's because the text is (correctly) converted from black to white, but the white background is not converted to something dark. Interestingly, the "logged off" is visible as black on white, so it would be invisible on the correct dark background. See attached file …