OS: Lubuntu 19.10
I have a need for my applications to be entirely dark-themed. Lubuntu 19.10 comes with Adwaita-dark (and Adwaita) for GTK2/3 applications. I've also added the materia-gtk-theme package so that I can choose Materia-dark instead of Adwaita-dark.
If I open Preferences > LXQt settings > Appearance, simply selecting a dark theme for GTK2 and GTK3 does the job for GTK2/3 applications (not shown).
The issue arises with making Qt applications look dark as well. None of the three default Qt styles, Breeze, Fusion, or Windows, provide dark-themed Qt applications.
Image showing pcmanfm-qt, kcalc, featherpad, qterminal all in the background and LXQt Appearance on top.
However, there is this:
To attempt uniform theming, either select similar style/theme (if available) across all lists, or select 'gtk2' Qt style (if available) to mimic GTK themes.
As the dropdown next to Qt Style shows, there's no 'gtk2' Qt style.
How do I install this 'gtk2' Qt style? Which package, preferably from the standard repositories, provides it?