Method _onTabExpandButtonClick

packages/main/src/TabContainer.ts:752–781

(e: Event)

	}

	async _onTabExpandButtonClick(e: Event) {
		e.stopPropagation();
		e.preventDefault();

		let tabInstance: TabInStrip;

		if (isTabInStrip(e.target as HTMLElement)) {
			tabInstance = e.target as TabInStrip;
		} else {
			tabInstance = getTabInStrip(e.target as HTMLElement) as TabInStrip;
		}

		if (tabInstance) {
			tabInstance.focus();
		}

		let opener = e.target as HTMLElement;

		if (e.type === "keydown" && !(e.target as TabInStrip).realTabReference.isSingleClickArea) {
			opener = (e.target as TabInStrip).querySelector(".ui5-tab-expand-button [ui5-button]")!;
		}

		// if clicked between the expand button and the tab
		if (!tabInstance) {
			this._onHeaderItemSelect(opener.parentElement as HTMLElement, e);
			return;
		}

		await this._togglePopover(opener, true);
	}

	_setPopoverInitialFocus() {
		const selectedTabInOverflow = this._getSelectedTabInOverflow();