src/vs/workbench/services/views/common/viewContainerModel.ts/ViewContainerModel/isEqualIcon
class ViewContainerModel:	private isEqualIcon(icon: URI | ThemeIcon | undefined): boolean {
		if (URI.isUri(icon)) {
			return URI.isUri(this._icon) && isEqual(icon, this._icon);
		} else if (ThemeIcon.isThemeIcon(icon)) {
			return ThemeIcon.isThemeIcon(this._icon) && ThemeIcon.isEqual(icon, this._icon);
		}
		return icon === this._icon;
	}