You're using a GTK+ 3 build of Geany, so your GTK+ 2 gtkrc theme isn't going to work anymore. Nothing has changed in Geany, just you (or your distro, PPA, etc.) has used the `--enable-gtk3` option when building Geany.

so if i change PPA to another with geany 1.33 compiled with gtk2 it would be work or not?

If it's built against GTK+ 2, it would work just as it did before.

Or how can i enable my old theme with gtk3?

You would have to port it to [GTK+ 3 CSS](https://developer.gnome.org/gtk3/stable/chap-css-overview.html). Unfortunately they changed just about everything between v2 and v3 to do with theming, but if you know CSS already, you'd probably find it easier/better in GTK+3.

Ok, finally solve with the help of Gtk Inspector. With these rules you can customize a dark theme for sidebar and dialogs (I didn't want to customize entire interface):

#GeanyDialog GtkButton, #GeanyDialog GtkButton GtkLabel, #GeanyDialog GtkButton GtkImage, #GeanyDialog GtkWidget GtkEntry, #GeanyDialog GtkWidget GtkButton { background: #f0f0f0; color: #000; }

#GeanyDialogSearch, #GeanyDialog, GtkTreeView { background: #1e1e1e; color: #fff; }

#GeanyDialog GtkWidget { background: transparent; }

GtkTreeView:hover, GtkTreeView:insensitive, GtkTreeView:active { background: #666; }

GtkTreeView:selected { background-color: #2F5692; color: #fff; }