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This fixes https://bugs.scummvm.org/ticket/11033 Removed checking printable property for system keys. Refactored whole function to make it a bit more readable. Reference implementations: https://github.com/retrowork/wmelite/blob/master/src/UIEdit.cpp#L724 https://github.com/retrowork/Wintermute-Engine/blob/master/src/engine_core/wme_base/UIEdit.cpp#L708