There is a problem with numbering parsing when reading the document

[sxhxliang]

Describe the bug

There is a problem with numbering parsing when reading the document.

Reproduced step

use docx_rs::*;
use std::io::{Read, Write};
pub fn main() -> Result<(), DocxError> {
    let path = std::path::Path::new("./numbering.docx");
    let file = std::fs::File::create(path).unwrap();
    Docx::new()
        .add_paragraph(
            Paragraph::new()
                .add_run(Run::new().add_text("Hello"))
                .numbering(NumberingId::new(2), IndentLevel::new(0)),
        )
        .add_abstract_numbering(
            AbstractNumbering::new(2).add_level(
                Level::new(
                    0,
                    Start::new(1),
                    NumberFormat::new("decimal"),
                    LevelText::new("Section %1."),
                    LevelJc::new("left"),
                )
                .indent(
                    Some(1620),
                    Some(SpecialIndentType::Hanging(320)),
                    None,
                    None,
                ),
            ),
        )
        .add_numbering(Numbering::new(2, 2))
        .build()
        .pack(file)?;


    // read file
    let mut file = std::fs::File::open("./numbering.docx").unwrap();
    let mut buf = vec![];
    file.read_to_end(&mut buf).unwrap();
    let docx_copy = read_docx(&buf).unwrap();

    // pack file
    let path = std::path::Path::new("./numbering_copy.docx");
    let file = std::fs::File::create(path).unwrap();
    docx_copy.build().pack(file)?;

    Ok(())

}

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

A clear and concise description of what you expected to happen.

Actual behavior

A clear and concise description of what you actual to happen.

Screenshots

./numbering.docx:

./numbering_copy.docx:

If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information)

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

[drewmiller]

These are the two offending lines around line 40 of numberings.rs:

impl BuildXML for Numberings {
    fn build(&self) -> Vec<u8> {
        let mut b = XMLBuilder::new().declaration(Some(true)).open_numbering();
        //b = b.add_child(&create_default_numbering()); // not needed on the second save
        for n in &self.abstract_nums {
            b = b.add_child(n);
        }
        //b = b.add_child(&Numbering::new(1, 1)); // not needed on the second save
        for n in &self.numberings {
            b = b.add_child(n);
        }
        b.close().build()
    }
}

[drewmiller]

Also needs:
...

    // Read numberings
    let num_path = rels.find_target_path(NUMBERING_RELATIONSHIP_TYPE);
    if let Some(paths) = num_path {
        if let Some((_, num_path, ..)) = paths.get(0) {
            let data = read_zip(
                &mut archive,
                num_path.to_str().expect("should have numberings"),
            )?;
            let nums = Numberings::from_xml(&data[..])?;
            docx = docx.numberings(nums);
            docx.document_rels.has_numberings = true; // this
        }
    }

Around line 679 in reader/mod.rs