Bug: Negation patterns with ! in ignore patterns don't work properly #400

I'm experiencing an issue where negation patterns using the ! prefix in ignore.customPatterns are not properly excluding files from being ignored.

It appears this is related to limitations in fast-glob's handling of negative ignore patterns:

• Ignore patterns don't work in ignore option mrmlnc/fast-glob#86 (comment)

related:

• allow ! ( and ) in ignorePatterns via website #396