Slightly stronger hash function in ui_hash_from_string() #218
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…less likely in practice
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The original hash function had a few collisions on the dictionary of English words, e.g. "hot"-"iOS". The hash doesn't change e.g. if a character is incremented and the next character is decreased by 33, e.g. "At"-"BS". There's maybe a not-completely-negligible chance that something like this would accidentally happen in practice, so here's a simple tweak to avoid it - just change 33 to 257.