src/vs/editor/browser/editorDom.ts/EditorMouseEvent/constructor
class EditorMouseEvent:	constructor(e: MouseEvent, isFromPointerCapture: boolean, editorViewDomNode: HTMLElement) {
		super(e);
		this.isFromPointerCapture = isFromPointerCapture;
		this.pos = new PageCoordinates(this.posx, this.posy);
		this.editorPos = createEditorPagePosition(editorViewDomNode);
		this.relativePos = createCoordinatesRelativeToEditor(editorViewDomNode, this.editorPos, this.pos);
	}