src/vs/workbench/browser/parts/compositeBarActions.ts/ActivityActionViewItem/updateLabel
class ActivityActionViewItem:	protected override updateLabel(): void {
		this.label.className = 'action-label';

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

		if (this.options.icon && !this.activity.iconUrl) {
			this.label.classList.add('codicon'); // Only apply codicon class to activity bar icon items without iconUrl
		}

		if (!this.options.icon) {
			this.label.textContent = this.action.label;
		}
	}