Default (Linux).sublime-keymap

[
    {"keys": ["ctrl+:"], "command": "toggle_comment", "args": { "block": false } },
    {"keys": ["ctrl+shift+:"], "command": "toggle_comment", "args": { "block": true } },

    { "keys": ["ctrl+space"], "command": "auto_complete" },
    { "keys": ["ctrl+space"], "command": "replace_completion_with_auto_complete", "context":
        [
            { "key": "last_command", "operator": "equal", "operand": "insert_best_completion" },
            { "key": "auto_complete_visible", "operator": "equal", "operand": false },
            { "key": "setting.tab_completion", "operator": "equal", "operand": true }
        ]
    },
]