Method _hasStartOverflow

packages/main/src/TabContainer.ts:1152–1179

(containerWidth: number, itemsDomRefs: Array<TabInStrip | TabSeparatorInStrip>, selectedItemIndexAndWidth: { width: number; index: number})

	}

	_hasStartOverflow(containerWidth: number, itemsDomRefs: Array<TabInStrip | TabSeparatorInStrip>, selectedItemIndexAndWidth: { width: number; index: number}) {
		if (this._getStartOverflow().textContent !== "+0") {
			return true;
		}

		if (selectedItemIndexAndWidth.index === 0) {
			return false;
		}

		let leftItemsWidth = 0;

		for (let i = selectedItemIndexAndWidth.index - 1; i >= 0; i--) {
			leftItemsWidth += this._getItemWidth(itemsDomRefs[i]);
		}

		let hasStartOverflow = containerWidth < leftItemsWidth + selectedItemIndexAndWidth.width;

		// if there is no "start" overflow, it has "end" overflow
		// check it again with the "end" overflow
		if (!hasStartOverflow) {
			this._getEndOverflow().removeAttribute("hidden");
			containerWidth = this._getTabStrip().offsetWidth;
			hasStartOverflow = containerWidth < leftItemsWidth + selectedItemIndexAndWidth.width;
			this._getEndOverflow().setAttribute("hidden", "");
		}

		return hasStartOverflow;
	}

	_hasEndOverflow(containerWidth: number, itemsDomRefs: Array<TabInStrip | TabSeparatorInStrip>, selectedItemIndexAndWidth: { width: number; index: number}) {
		if (selectedItemIndexAndWidth.index >= itemsDomRefs.length) {