src/vs/workbench/api/browser/mainThreadTreeViews.ts/MainThreadTreeViews/$setMessage
class MainThreadTreeViews:	$setMessage(treeViewId: string, message: string): void {
		this.logService.trace('MainThreadTreeViews#$setMessage', treeViewId, message);

		const viewer = this.getTreeView(treeViewId);
		if (viewer) {
			viewer.message = message;
		}
	}