src/vs/editor/browser/viewParts/lines/viewLine.ts/FastRenderedViewLine/constructor
class FastRenderedViewLine:	constructor(domNode: FastDomNode<HTMLElement> | null, renderLineInput: RenderLineInput, characterMapping: CharacterMapping) {
		this.domNode = domNode;
		this.input = renderLineInput;

		this._characterMapping = characterMapping;
		this._charWidth = renderLineInput.spaceWidth;
	}