src/vs/base/browser/ui/actionbar/actionViewItems.ts/ActionViewItem/_applyUpdateTooltip
class ActionViewItem:	protected _applyUpdateTooltip(title: string | undefined | null): void {
		if (title && this.label) {
			this.label.setAttribute('aria-label', title);
			if (!this.options.hoverDelegate) {
				this.label.title = title;
			} else {
				this.label.title = '';
				if (!this.customHover) {
					this.customHover = setupCustomHover(this.options.hoverDelegate, this.label, title);
					this._store.add(this.customHover);
				} else {
					this.customHover.update(title);
				}
			}
		}
	}