James McCoy wrote:
> According to “:help 'formatexpr'”,
>
> The expression is also evaluated when 'textwidth' is set and adding
> text beyond that limit.
>
> However, even when 'formatoptions' doesn't contain "a", one can see that
> a set 'formatexpr' is called every time a character is typed, regardless
> of whether 'textwidth' is exceeded. In fact, most of the (rather few)
> uses of 'formatexpr' which explicitly handle insert-mode reformatting
> have added the check that the help claims to already be doing.
>
> In order to reduce the amount of boilerplate in scripts and conform
> better to the help, the attached patch performs this check for the user.
> Note, 'formatexpr' will still be called if the cursor is < 'textwidth'
> but other conditions necessitate formatting (like the "a" formatoption).
Perhaps we need to update the documentation. The problem is that
computing virtcol is expensive. It should at least use the cached value
w_virtcol, if it's valid.
I also think that if we have this check for using 'formatexpr', then it
should also be used for the internal formatting.
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