I upgraded my OS from Debian Stretch to Buster, which upgraded Geany from 1.29-1 to 1.33-1. I found that Geany had switched from GTK2 to GTK3. GTK3 does not have as many available themes as GTK2 has. Currently I have found that Debian only offers six GTK3 themes. My favorite theme, the only one that does not assault my eyes, is not available in GTK3 through Debian's package system. So, this me wishing that Geany have a preference to use, my chosen, GTK2 theme instead of the default GTK3 theme, at least until all GTK2 themes have been converted to GTK3.