Stop TextIterator from checking margin when adding double newlines after <p>

[Ahmad Saleem]

Hi Team,

While looking into Blink commits, I noticed the test expectation changes between our current vs Blink and noticed that we don't have this merged / aligned:

Blink Commit: https://chromium.googlesource.com/chromium/src.git/+/8ff781cd5c1aabca068247de9a3f143645e80422

I took following test as example: fast/css-generated-content/hover-inline-expected.txt (See from source.chromium.org vs GitHub webkit repo) - Chrome / Blink adds additional space.

WebKit Source: https://github.com/WebKit/WebKit/blob/983b6c8a16f0fbe166336a0c9653cd8eca72f639/Source/WebCore/editing/TextIterator.cpp#L929

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In above, if I do following:

Current:

RefPtr element = dynamicDowncast<HTMLElement>(node);
    if (!element || (!hasHeaderTag(*element) && !is<HTMLParagraphElement>(*element)))
        return false;

to:

RefPtr element = dynamicDowncast<HTMLElement>(node);
    if (is<HTMLParagraphElement>(*element))
        return true;

    if (!element || !hasHeaderTag(*element))
        return false;

___

In debug build, it leads to following 'assert' while running WPT test (e.g., https://wpt.fyi/results/html/dom/elements/the-innertext-and-outertext-properties/getter.html?label=master&label=experimental&aligned&q=innertext)

ASSERTION FAILED: m_ptr
/Users/ahmadsaleem/Documents/GitHub/WebKit/WebKitBuild/Debug/usr/local/include/wtf/RefPtr.h(68) : T &WTF::RefPtr<WebCore::HTMLElement>::operator*() const [T = WebCore::HTMLElement, _PtrTraits = WTF::RawPtrTraits<WebCore::HTMLElement>, _RefDerefTraits = WTF::DefaultRefDerefTraits<WebCore::HTMLElement>]
2024-04-24 19:45:05.336 MiniBrowser[43249:479598] WebContent process crashed; reloading

___

Just wanted to raise so we can track and fix it.

Thanks!

[Ahmad Saleem]

We can just change this whole function to follow like this:

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/editing/iterators/text_iterator.cc;l=702?q=the-innertext-idl-attribute

and it will or might progress few WPT tests in: https://wpt.fyi/results/html/dom/elements/the-innertext-and-outertext-properties/getter.html?label=master&label=experimental&aligned&q=innertext

[Ahmad Saleem]

This progresses six tests without leading to crashes:

static bool shouldEmitExtraNewlineForNode(Node& node)
{
    // https://html.spec.whatwg.org/multipage/dom.html#the-innertext-idl-attribute
    // // Append two required linebreaks after a <p> element.

    CheckedPtr renderBox = dynamicDowncast<RenderBox>(node.renderer());
    if (!renderBox || !renderBox->height())
        return false;

    return node.hasTagName(pTag);
}

[Ahmad Saleem]

*** This bug has been marked as a duplicate of bug 176776 ***