Changes the currently opened directory to the one passed as an argument. The argument can be relative to the current directory (e.g. [code]newdir[/code] or [code]../newdir[/code]), or an absolute path (e.g. [code]/tmp/newdir[/code] or [code]res://somedir/newdir[/code]).
Returns one of the [enum Error] code constants ([constant OK] on success).
+ [b]Note:[/b] The new directory must be within the same scope, e.g. when you had opened a directory inside [code]res://[/code], you can't change it to [code]user://[/code] directory. If you need to open a directory in another access scope, use [method open] to create a new instance instead.
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