Some apps not showing selected_fg_color on highlighted items
This isn't happening with all GTK themes, but on some themes, including any GTK themes created with the Oomox theme builder (https://github.com/themix-project/oomox), whenever you highlight a file or folder, the selected_fg_color fails to appear (the normal fg_color is being used with the selected_bg_color, which it shouldn't be), which, depending on the theme, can make highlighted items hard to read. This is happening at least in Thunar (oddly, in Thunar, it's correct in the side pane but not in the main pane) and the main page of the settings dialog, and possibly other applications. I've attached a screenshot to give you an idea of what's going on. Here, the selected_fg_color should be white, not black.