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Sublime Text - Go to definition

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You'll want to find out the command that is represented by this menu entry (using sublime.log_commands() in the console) and then create a mousemap file in the packages/User, according to this reference.

Default (OSX).sublime-mousemap
    "button": "button1",
    "count": 1,
    "modifiers": ["option"],
    "press_command": "drag_select",
    "command": "lsp_symbol_definition"
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