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Changes
→fullscreen: Added fullscreen
You may use either of these implementations of setLine or use any third implementation that you prefer.
==== bool fullscreen() const ====
It may be a good idea to add a functin that returns whether a frame is currently in fullscreen mode or not. This is simple and will make code that cares about whether a frame is currently in fullscreen mode simpler to write. This function may be public or protected (not much use if it is private).
== CField ==