Codebase Clash

As the newly hired senior developer for Inkscape, your primary objective is to lead the crucial migration project to a newer GUI framework version, i.e. GTK4, as quickly as possible. You will need to manage the complex process by coordinating with a GTK expert and other Inkscape developers, while ensuring that all essential steps are carried out seamlessly. The fate of Inkscape's UI and canvas performance rests entirely on the success of this mission!