src/vs/base/browser/ui/actionbar/actionViewItems.ts/BaseActionViewItem/updateTooltip
class BaseActionViewItem:	protected updateTooltip(): void {
		if (!this.element) {
			return;
		}
		const title = this.getTooltip() ?? '';
		this.updateAriaLabel();
		if (!this.options.hoverDelegate) {
			this.element.title = title;
		} else {
			this.element.title = '';
			if (!this.customHover) {
				this.customHover = setupCustomHover(this.options.hoverDelegate, this.element, title);
				this._store.add(this.customHover);
			} else {
				this.customHover.update(title);
			}
		}
	}