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In the past, I saved special words in the file being checked (as comments). I no longer can work out how to do this.
I remember there was an option when checking a word: add to global dictionary, add to local dictionary, add to file.
After doing this the word would not be marked as wrong, this persisted when the file was reopened in the future.
So how do I save a spelling to the file being checked (as a comment)?