Very long code block

[zhanzhenzhen]

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Describe the bug
If the code block is very long (this example contains 697 lines) and matches a certain pattern (for example, the first line is long), then the code block is not rendered. It just outputs an empty block.

Checklist

• I can reproduce this issue with a vanilla SwiftUI project.
• I can reproduce this issue using the main branch of this package.
• This bug hasn't been addressed in an existing GitHub issue.

Steps to reproduce

Assign this long string (given at the bottom of this comment) to longText and use Markdown(longText) to see the effect. The code block isn’t rendered. Screenshot:

But if I use a custom style without using ScrollView(.horizontal), as follows:

Markdown(longText)
.markdownBlockStyle(\.codeBlock) { configuration in
    configuration.label
    .fixedSize(horizontal: false, vertical: true)
    .relativeLineSpacing(.em(0.15))
    .markdownTextStyle {
        FontFamilyVariant(.monospaced)
    }
    .padding(10)
    .frame(maxWidth: .infinity, alignment: .leading)
    .background(.black.opacity(0.1))
    .markdownMargin(top: .zero, bottom: .em(1))
}

It’s rendered:

This is the longText:

let longText = """
This is a code block:

```
abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg abcdefg
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```
"""

Markdown(longText)

Expected behavior
I expect the code block to be rendered when using the default theme (with horizontal scroll view).

Version information

• MarkdownUI: 2.3.1
• OS: iOS 17.5.1, macOS 15.0 beta 2
• Xcode: 16.0 beta 2

[zhanzhenzhen]

I updated the description of the issue. Added two screenshots.

[zhanzhenzhen]

@gonzalezreal Could you please have a look?