src/vs/editor/common/cursor/cursorCollection.ts/CursorCollection/getLastAddedCursorIndex
class CursorCollection:	public getLastAddedCursorIndex(): number {
		if (this.cursors.length === 1 || this.lastAddedCursorIndex === 0) {
			return 0;
		}
		return this.lastAddedCursorIndex;
	}