Jacob Niehus wrote:

> After a single backslash is added as an item in a comma-separation
> option, the items after the backslash can't be removed without removing
> the backslash first.
> 
> For example:
> 
> set iskeyword+=\\,!
> --> iskeyword=@,48-57,_,192-255,\,!
> set iskeyword-=!
> --> iskeyword=@,48-57,_,192-255,\,!
> set iskeyword-=\\
> --> iskeyword=@,48-57,_,192-255,!
> set iskeyword-=!
> --> iskeyword=@,48-57,_,192-255
> 
> This also happens for &cinkeys, &dictionary, etc. The change below
> fixes the problem and didn't cause any obvious new problems.

That backslash behavior is a bit confusing.  But after your patch it
looks like it works OK.

I'll also add a test for this.


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