src/vs/workbench/contrib/debug/common/debugModel.ts/DebugModel/moveWatchExpression
class DebugModel:	moveWatchExpression(id: string, position: number): void {
		const we = this.watchExpressions.find(we => we.getId() === id);
		if (we) {
			this.watchExpressions = this.watchExpressions.filter(we => we.getId() !== id);
			this.watchExpressions = this.watchExpressions.slice(0, position).concat(we, this.watchExpressions.slice(position));
			this._onDidChangeWatchExpressions.fire(undefined);
		}
	}