Avoid running get_words twice when opening new file #1513
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Description
Small fix to make a small performance improvement when opening a file the first time.
Avoids running get_words twice from did_open, and also makes the set created in get_words use version 2 which is a bit more efficient, supported from OTP24.
On a big file like erlfmt_parse.erl on my computer the time spent went from about 960ms to ~850ms.