Re: [PATCH] wildmatch: properly fold case everywhere

> Case folding is not done correctly when matching against the [:upper:]
> character class and uppercased character ranges (e.g. A-Z).
> Specifically, an uppercase letter fails to match against any of them
> when case folding is requested because plain characters in the pattern
> and the whole string and preemptively lowercased to handle the base case
> fast.
>
> That optimization is kept and ISLOWER() is used in the [:upper:] case
> when case folding is requested, while matching against a character range
> is retried with toupper() if the character was lowercase, as the bounds
> of the range itself cannot be modified (in a case-insensitive context,
> [A-_] is not equivalent to [a-_]).
>
> Signed-off-by: Anthony Ramine <n.oxyde@gmail.com>