Heading style applied incorrectly?

[josephlord]

A second line with space character turns the first line into a heading. The first example here is fine but the second with the space between the newlines causes 28 point font to be applied to the first line.

It is possible that this is correct behaviour and is just an aspect of Markdown that I wasn't aware of. My expectation was not of a styling change between the two strings ("Boom\n\nBang" and "Boom\n \nBang")

(lldb) po renderer.attributedString(from: "Boom\n\nBang")
Boom{
    NSColor = "<UIDynamicSystemColor: 0x600000dcb040; name = labelColor>";
    NSFont = "<UICTFont: 0x7fc4910182b0> font-family: \"UICTFontTextStyleBody\"; font-weight: normal; font-style: normal; font-size: 17.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0 LineBreakStrategy 0";
}

{
}Bang{
    NSColor = "<UIDynamicSystemColor: 0x600000dcb040; name = labelColor>";
    NSFont = "<UICTFont: 0x7fc4910182b0> font-family: \"UICTFontTextStyleBody\"; font-weight: normal; font-style: normal; font-size: 17.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0 LineBreakStrategy 0";
}

(lldb) po renderer.attributedString(from: "Boom\n \nBang")
Boom{
    NSColor = "<UIDynamicSystemColor: 0x600000dcb040; name = labelColor>";
    NSFont = "<UICTFont: 0x7fc4874f9d30> font-family: \"UICTFontTextStyleTitle1\"; font-weight: normal; font-style: normal; font-size: 28.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0 LineBreakStrategy 0";
}
{
}Bang{
    NSColor = "<UIDynamicSystemColor: 0x600000dcb040; name = labelColor>";
    NSFont = "<UICTFont: 0x7fc4910182b0> font-family: \"UICTFontTextStyleBody\"; font-weight: normal; font-style: normal; font-size: 17.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0 LineBreakStrategy 0";
}

I might be able to look into fixing this but would prefer confirmation that it is regarded as a bug before I spend time on it.