src/vs/editor/common/languages/languageConfiguration.ts/StandardAutoClosingPairConditional/_findNeutralCharacterInRange
class StandardAutoClosingPairConditional:	private _findNeutralCharacterInRange(fromCharCode: number, toCharCode: number): string | null {
		for (let charCode = fromCharCode; charCode <= toCharCode; charCode++) {
			const character = String.fromCharCode(charCode);
			if (!this.open.includes(character) && !this.close.includes(character)) {
				return character;
			}
		}
		return null;
	}