DataGrid ColumnHeader Border Changed from v6 to v7

[avalyons-wk]

Steps to reproduce

Link to live example:
v7 example: https://codesandbox.io/s/dfntjc?file=/src/Demo.tsx
v6 example: https://codesandbox.io/s/9vpynd?file=/src/Demo.tsx

Steps:

1. Open the link
2. Look at the difference of the columnHeader border of each example

Current behavior

v6's DataGrid columnHeaders had a border that was around every edge of the cell. v7 has a border that touches the sides and the top of the cell.

Expected behavior

There either should be a border around the whole cell for a columnHeader for v7 or documentation of the change of the border.

Context

There was no documentation of this change from v6 to v7 for the columnHeader border changing. Is this an expected change?

Your environment

npx @mui/envinfo

  System:
    OS: macOS 13.6.3
  Binaries:
    Node: 20.11.1 - ~/.nvm/versions/node/v20.11.1/bin/node
    npm: 10.8.1 - ~/.nvm/versions/node/v20.11.1/bin/npm
    pnpm: Not Found
  Browsers:
    Chrome: 126.0.6478.127

Search keywords: DataGrid Column Header

Search keywords:

[Tabish8756]

@avalyons-wk in the sand box not able to see any difference can you please elaborate more on this or if you can put comparison screen shot it would be better.

[avalyons-wk]

v7's border doesn't have the bottom part to it.

[KenanYusuf]

Thanks for reporting the issue @avalyons-wk, there are a few glitches related to the focus outline on column headers that we are aware of. This one specifically is also noted on this issue: #11225

I will close this issue for now, and we can prioritise and track the progress of this on the other issue.

[github-actions]

⚠️ This issue has been closed. If you have a similar problem but not exactly the same, please open a new issue.
Now, if you have additional information related to this issue or things that could help future readers, feel free to leave a comment.

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