src/vs/workbench/api/common/extHostTreeViews.ts/ExtHostTreeView/badge
class ExtHostTreeView:	set badge(badge: vscode.ViewBadge | undefined) {
		if (this._badge?.value === badge?.value &&
			this._badge?.tooltip === badge?.tooltip) {
			return;
		}

		this._badge = ViewBadge.from(badge);
		this.proxy.$setBadge(this.viewId, badge);
	}