Nested 'block' with minus sign not being parsed

When using the word block for creating nested blocks as per the example:

[block]
  [-block]
    [--block]
      ...
    [/--block]
  [/-block]
[/block]

Any blocks with a minus sign don’t get parsed. It seems this is because the “block” tag was not added to the “nested” array in the ../optional/block.php file on line 59. Adding it to that array seems to have fixed the problem.

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