src/vs/base/browser/ui/actionbar/actionViewItems.ts/ActionViewItem/updateTooltip
class ActionViewItem:	override updateTooltip(): void {
		let title: string | null = null;

		if (this.getAction().tooltip) {
			title = this.getAction().tooltip;

		} else if (!this.options.label && this.getAction().label && this.options.icon) {
			title = this.getAction().label;

			if (this.options.keybinding) {
				title = nls.localize({ key: 'titleLabel', comment: ['action title', 'action keybinding'] }, "{0} ({1})", title, this.options.keybinding);
			}
		}

		if (title && this.label) {
			this.label.title = title;
		}
	}