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3beb187cac
MetaKeyCombo is about the *unresolved* keybinding, which can either be a "keysym" (<Ctrl>F) or a "keycode" (<Ctrl>0x21). When we resolved the keysym to a keycode, we stuffed it back in the same MetaKeyCombo, which confused about what the "keycode" field was for. Thus, we often stomped on the user's explicit choice if they chose a keycode binding value. To solve this, create a separate structure, the "devirtualized key combo" or MetaKeyDevirtCombo, which contains a resolved keycode from the keysym, and a devirtualized modifier mask. The MetaKeyCombo is now always a "source" value, and the MetaKeyDevirtCombo is now always what the user chose. This also lets us significantly clean up the overlay and ISO key binding paths.