[Geany-Users] Force Geany to use GTK-2 theme

[cyc19921205 at gmail.com]

I have been using Geany as my editor for years, and I'm used to the theme.
Recently I upgraded Geany to the latest version, and found that it has been
using GTK-3 theme. I hate GTK-3 theme and want Geany to use GTK-2 theme.
How may I make it?
My environment:
Archlinux with glibc 2.26-11 gtk2 2.24.32-1 gtk3 3.22.28-1
Xfce 4.12
Geany 1.33.0-2

(Also, I don't mind making all my apps using GTK-2 theme.)
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