Fixed pathological cases with backtick code spans:

- Removed recursion in scan_to_closing_backticks
- Added an array of pointers to potential backtick closers
  to subject
- This array is used to avoid traversing the subject again
  when we've already seen all the potential backtick closers.
- Added a max bound of 1000 for backtick code span delimiters.
- This helps with pathological cases like:

        x
        x `
        x ``
        x ```
        x ````
        ...

Thanks to Martin Mitáš for identifying the problem and for
discussion of solutions.

0 files changed, 0 insertions, 0 deletions