src/vs/base/browser/ui/actionbar/actionViewItems.ts/ActionViewItem/updateClass
class ActionViewItem:	protected override updateClass(): void {
		if (this.cssClass && this.label) {
			this.label.classList.remove(...this.cssClass.split(' '));
		}

		if (this.options.icon) {
			this.cssClass = this.action.class;

			if (this.label) {
				this.label.classList.add('codicon');
				if (this.cssClass) {
					this.label.classList.add(...this.cssClass.split(' '));
				}
			}

			this.updateEnabled();
		} else {
			this.label?.classList.remove('codicon');
		}
	}