I am seeing this same problem, and a workaround is to use Liberation Mono Regular font. For whatever design reason, the underscores are visible in Geany with this font. Not an ideal solution, but it is a workaround that lets you keep using Geany.
I am seeing this same problem, and a workaround is to use Liberation Mono Regular font. For whatever design reason, the underscores are visible in Geany with this font. Not an ideal solution, but it is a workaround that lets you keep using Geany.