Use GTK emoji chooser on Linux
Makes use of the GTK-native emoji chooser on Linux. This is not cross-plattform compatible, therefore not possible on Windows (yet).
What needs to be resolved: Emoji button remains in This is a MenuButton which stays in
toggled state after clicking. I guess I'm missing some signal handling here?
toggled state. I solved this by setting the button’s
active property to False after emiting the insert-emoji signal. This solves the issue, but may not be the optimal solution.