Suppor for gui-specific zoom steps
Make it possible for the gui component to define its own zoom steps.
Targeting to all versions where gtk4-client is present, as it's likely to use this a bit later (wants steps different from gtk3.22-client ones)
Make it possible for the gui component to define its own zoom steps.
Targeting to all versions where gtk4-client is present, as it's likely to use this a bit later (wants steps different from gtk3.22-client ones)