Materia-dark: thunderbird calendar time selection dialog very hard to read (black on dark grey)

[ptandler]

Reporter Info

• Materia version: Materia-dark-compact, commit af63425f9bbb2ac9bc4853a4357457d743c65308 / master / Thu Dec 2 13:15:58 2021 -0300
• GTK3 version: 3.24.20
• Distribution (and version): Mint 20.2
• Desktop environment (and version): Cinnamon 5.0.7
• Related application (and version): Thunderbird 78.14.0

Actual Issue

When creating / editing a new appointment in the TB calendar (Lightning), the dropdown dialog to choose the time has black on dark grey text (if not selected and not hovered):

Might be related to issues #560 and #584?

[ptandler]

And I guess this issue in LibreOffice (version 7.2.3.2) is related (or should I open another issue for it?) When using the grouped UI mode, the buttons also are black on dark grey:

[ptandler]

Let me add: I recently discovered Materia (via Papirus icons) and I just love it! Thanks for all your work!