Method rotateLeft

src/layout/msWorkspace/portion.ts:205–209

* rotate order of portions by one in previous direction

()

     * rotate order of portions by one in previous direction
     */
    rotateLeft() {
        const lastChild = this.children.pop();
        if (lastChild) this.children.splice(0, 0, lastChild);
        this.updateBorders();
    }

    isBorderInSubPortion(index: number, after = false): boolean {
        let portionIndex = 0;