Method shift

src/layout/msWorkspace/portion.ts:147–168

()

    }

    shift() {
        // If this portion has less than 3 portions, it means that when
        // want to delete one, this portion describes the space.
        if (this.portionLength <= 2) {
            this.children = [];
            this.borders = [];

            return;
        }

        const child = this.children[0];

        if (child) {
            if (child.children.length) {
                child.shift();
            } else {
                this.children.shift();
            }
        }

        this.updateBorders();
    }

    pop() {
        // If this portion has less than 3 portions, it means that when