src/vs/workbench/contrib/debug/common/debugModel.ts/DebugModel/renameWatchExpression
class DebugModel:	renameWatchExpression(id: string, newName: string): void {
		const filtered = this.watchExpressions.filter(we => we.getId() === id);
		if (filtered.length === 1) {
			filtered[0].name = newName;
			this._onDidChangeWatchExpressions.fire(filtered[0]);
		}
	}