Grid layout is broken when subgrid is expanded

Description

Contributor guide

Tech stack

javascript

Domain

frontend

Issue type

bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

half day

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

unclear

Prerequisites

Basic CSS understandingUI Grid subgrid knowledge

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

20

Research direction

Investigate the plunkr link (http://plnkr.co/edit/xdcr2EHO6KgEsrZmurDs?p=preview) to reproduce the layout issue. Review the UI Grid source code for subgrid related components, focusing on CSS and DOM manipulation during expansion. Check the existing comments for any further details or partial solutions.