Bug 283621 – Repaint not triggered when only text-underline-offset changes

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

# Step to reproduce

1) Go to https://jsfiddle.net/6t73Lekh/ (or use the code provided below)
2) Hover your cursor over the links.

```html
<style>
a {
  text-decoration: underline;
  text-decoration-skip-ink: none;

  &:hover {
    text-underline-offset: -5px;
  }
}

#ok:hover {
  color: orange;
}
</style>

<a href="https://example.com" id="ok">OK</div>
<a href="https://example.com" id="ng">NG</div>
```

Expected Results:
A repaint should be triggered, and the underline should move up to the middle of the link when hovering.

Actual Results:
The repaint does not occur, and the underline remains in its original position for now.

# Potential Cause:
This issue might be due to a missing comparison in the `RenderStyle::changeRequiresRepaintIfText`.
Specifically, we should check: `m_rareInheritedData->textUnderlineOffset != other.m_rareInheritedData->textUnderlineOffset`.

https://github.com/mdubet/WebKit/blob/4a51bf6f3d5146526cc00c18289073f512e40637/Source/WebCore/rendering/style/RenderStyle.cpp#L1345-L1354

Oops, I accidentally shared the fork URL. Here's the original: https://github.com/WebKit/WebKit/blob/d0f5adbe2b117c3a9c7755d54e7ddf643b8a672f/Source/WebCore/rendering/style/RenderStyle.cpp#L1346-L1353

Pull request: https://github.com/WebKit/WebKit/pull/37074

[EWS]

Committed 287048@main (958c0c8b47a0): <https://commits.webkit.org/287048@main>

Reviewed commits have been landed. Closing PR #37074 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/140517513>