Fix for finding the longest word in terms of size instead of characte…

[davevdveen]

…r count

Issue #94

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[Adlai-Holler]

Hey thanks for the diff. We've seen thread-safety issues in the past with boundingRectWithSize: despite the claims of the documentation, and the performance penalty here is likely to be tremendous.

One improvement we can make off the bat is to avoid using rangeOfString: and instead use enumerateSubstrings which will give us the ranges directly. Beyond that, I'll try to find time to profile this change in the near future, but of course you're right that this algorithm is correct.

[nguyenhuy]

@Adlai-Holler @davevdveen Please follow up on this PR.