I use i3 as my primary user interface. To start applications I use Rofi which I execute as:
rofi -show drun -drun-icon-theme MacBuntu-Remix
where MacBuntu-Remix is a theme I have installed in ~/.icons. On Gentoo Linux this command causes icons to appear next to application names in Rofi, but under Debian this exact same command, with the exact same ~/.icons folder, produces a Rofi menu without these icons next to applications. Anyone know why? Did the Debian packagers decide not to compile rofi with this option, or?
To fix this I've tried switching from using Rofi in the Stretch repositories to using Rofi in the unstable repository, in the hope it was simply an older version of Rofi that was causing the problem, this didn't fix it, however. I have also tried switching icon themes to something I was certain was installed properly (although I was confident MacBuntu-Remix was it appeared fine under GNOME), Adwaita. The icons didn't appear then either. Here's a screenshot of Rofi running under Debian 9, started with the above MacBuntu-Remix theme command: