Spellcheck hogging cpu in master

[Ashod Nakashian]

Just a note as I noticed master (pulled Sat 20th) is consuming unreasonably
high cpu on Windows (debug, dbg_util enabled). Please ignore if this is a
known issue.

Even with a 2 A4 worth of text, it's taking up to a minute to settle down
(on i7 3930K). UI is of course unresponsive during that time (which makes
testing something of a challenge).

I'm fairly certain a couple of weeks (say a month) back I could load the
same document and others much larger without issue.
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