Locking is not determined by button state any more, but rather based on the view active at the moment. If pressing/locking a key results in the current view being active, the key is active. If locking a key results in the current view, the unlock view is activated.
Sizes of widgets can be derived, so storing them was only for C compatibility. Similar with storing position inside of widgets.
Some layout margin and scaling changes could be introduced, meaning a possibility of visual differences.
Moved Cairo context usage to Rust, and rearranged ctx setup (position) to happen in one place.
Removed render calls that were overwritten on each draw call anyway.
