I've replaced deprecated gtk+ functions in exo with their new versions, it compiles fine with -DG_DISABLE_DEPRECATED and -DGTK_DISABLE_DEPRECATED now.
Everything that was marked as deprecated in 2.20 is replaced, there are 2 functions marked as deprecated in 2.22 that I couldn't replace:
- gtk_dialog_set_has_separator, which defaults to FALSE in 2.22, so it can be removed as soon as 2.22 is required
- GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS) in exo/exo-private.c, line 68; GTK_WIDGET_UNSET_FLAGS is deprecated and should be replaced by other functions, but there is only gtk_widget_grab_focus which sets GTK_HAS_FOCUS, no function to unset it afaict.

Apart from that, most of this was pretty straightforward, but please take additional caution when looking over exo-helper-chooser.c, both changes (GtkTooltips -> gtk_widget_set_tooltip_text and gtk_button_released -> g_signal_emit_by_name) are a bit more complex than just replacement and especially with the signals, I'm not quite sure if it's correct. I've also left the old deprecated "released" signal in, because I don't know if it's used somewhere and I don't want to break API (the function is public).