[semantic tokens] The concept of "-" minus feels weird

[alexdima]

Testing #85972

The concept of removing a fontStyle is super weird.

For example:

"*.static": {
  "fontStyle": "italic"
},
"*.abstract": {
  "fontStyle": "underline-italic"
}

That just reads as if I asked for underline and italic, but it means underline, remove italic if set. IMHO this is super complex and foreign coming from TM grammars / CSS styling...

[alexdima]

Also, the none appears to be broken:

        "*.static": {
            "fontStyle": "italic"
        },
        "*.abstract": {
            "fontStyle": ""
        },