The GTK4 Migration

You are the newly hired senior C++ developer with experience in gtkmm, tasked with accelerating the GTK4 migration for Inkscape in a 16-week full-time schedule. You must work closely with an Inkscape expert with intimate knowledge of the codebase to ensure the C++ bindings (gtkmm, pangomm, cairomm, etc.) are adequate, and perform essential steps in the migration.