Alignment of nested lists breaks across pages

[RyanCarroll7]

Describe the bug
When a nested list spans a page boundary, the indentation is reset. This causes the nested items to be unaligned from each other.

To Reproduce
Steps to reproduce the behavior:

1. Place an IContainer.Markdown() element that contains a long, nested list on a document
   Example string (uses QuestPDF.Helpers.Placeholders): textExample.txt
2. Generate and view the document

Expected behavior
The indentation of each level of the nested list should persist across page boundaries.

Screenshots

(The items that should be aligned are connected by the colored lines)

Environment (please complete the following information):

• OS and version: Windows 11 24H2
• OS Platform: x64
• QuestPDF Version: 2024.12.2
• QuestPDF.Markdown Version: 1.28.0

Additional context
The root cause of the problem seems to be that the width of AutoItem does not persist across pages. This can be seen in the Companion App:

[christiaanderidder]

Hi @RyanCarroll7

I had a look at the problem and the same issue seems to occur when only using QuestPDF itself and building a list as suggested in the QuestPDF docs:

var doc = Document.Create(container =>
{
    container.Page(page =>
    {
        page.Size(PageSizes.A4);
        page.Margin(1, Unit.Centimetre);
        page.DefaultTextStyle(text =>
        {
            text.FontFamily(Fonts.Arial);
            text.LineHeight(1.5f);
            return text;
        });

        page.Content()
            .PaddingVertical(20)
            .Column(main =>
            {
                main.Spacing(20);
                main.Item()
                    .Column(c1 =>
                    {
                        foreach (var i in Enumerable.Range(1, 5))
                        {
                            c1.Item().Row(r1 =>
                            {
                                r1.Spacing(5);
                                r1.AutoItem().Text($"{i}."); // text or image
                                r1.RelativeItem().Column(c2 =>
                                {
                                    foreach (var j in Enumerable.Range(1, 15))
                                    {
                                        c2.Item().Row(r2 =>
                                        {
                                            r2.Spacing(5);
                                            r2.AutoItem().Text($"{j}."); // text or image
                                            r2.RelativeItem().Text(Placeholders.Sentence());
                                        });
                                    }
                                });
                            });
                        }
                    });
            });
    });
});

You are indeed correct that the problem is the AutoItem not retaining its width across the page boundary, but I think this might be an issue with QuestPDF itself.

[christiaanderidder]

I've submitted an issue on the QuestPDF repository, you can find it here: QuestPDF/QuestPDF#1091