xkeyboard-config

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default partial xkb_types "default" {
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    virtual_modifiers  Alt;
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    type "SHIFT+ALT" {
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	modifiers = Shift + Alt;
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	map[Shift+Alt] = Level2;
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	level_name[Level1] = "Base";
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	level_name[Level2] = "Shift+Alt";
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    };
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};
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