- Pre-added some style-classes and skeletons for upstream changes (Cinnamon).
- Added GtkButtonBox specific button node styling (Gtk+ 2.0).
- Removed filled backgrounds from insensitive flat-buttons (Gtk+ 2.0).
- Added more workarounds for Inkscape 0.92.0+ (Gtk+ 3.2x/4.0).
- Tweaked some button shapes on Glade 3.22 (Gtk+ 3.22/4.0).
[Important Change]
- Dropped Gtk+ 3.18.x support completely.