Dashboard widgets border bottom issue when it is closed in version 7.0 RC2

[Pratik Jain]

In WordPress 7.0 RC2 version,
When dashboard widgets are closed then we can see a straight border bottom without round.

[Pratik Jain]

Dashboard Widget Border Bottom Issue

[Pratik Jain]

Confirmed the bug persists in both Firefox and Chrome. Applying the CSS snippet below will standardize the behavior across both browsers,

We need to remove this CSS

.postbox.closed {border-bottom: 0;}

We need to add this CSS

.postbox.closed .postbox-header{border-bottom: 0;}

[ankitkumarshah]

Fix linting issue

[ankitkumarshah]

Before

After

[audrasjb]

In 62206:

Administration: Improve dashboard widgets border styles.

This changeset fixes a CSS glitch on dashboard widgets bottom border when they are collapsed.

Follow-up to [61646].

Props pratik-jain, audrasjb, ankitkumarshah.
Fixes #65017.
See #64549.

[audrasjb]

Reopening for 7.0 backport.