paste-from-office: Losing indent level for nested lists of different type (numbered, bullet)

[mmichaelis]

📝 Reproduction Steps

1. Created a nested list in MS Word (Office 365) as follows:

   • Lorem
   • Ipsum
     1. Dolor
     2. Sit
   • Amet

   See Copy-Paste-Mixed-List-Issue-CKEditor.docx (first list shows error; second list works).

2. Copy the entire list

3. Paste it for example to CKEditor 5 demo

✔️ Expected result

Just as all other nested lists (even for mixed outer numbered, inner bullet) the nested indentation levels should be kept as is.

❌ Actual result

Indentation level of nested list is set to 0:

• Lorem
• Ipsum

1. Dolor
2. Sit

• Amet

📃 Other details

• Browser: Chrome
• OS: Windows 10
• Office: MS Word; Office 365
• CKEditor version: Most recent (CKEditor 5 demo) as well as custom using "@ckeditor/ckeditor5-paste-from-office": "^20.0.0"
• Installed CKEditor plugins: "@ckeditor/ckeditor5-paste-from-office": "^20.0.0"

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[FilipTokarski]

Hi, thanks for the report. I confirm this bug. However it seems to occur only if you have numbered items inside bulleted list, otherwise the indentation works fine:

• occurs also on older versions
• browser: any

[pomek]

Lists in Word use the id property for marking the whole list as a structure. It means that nested lists have the same value of the property as their parents.

All list items have the same id:

However, for some, unknown reason, the first list in the attached document has mixed id values (a parent and a nested list are not the same).

I would say: I can reproduce the issue and I can't reproduce the issue at the same time. It depends on which list I use.

The list used for testing:

• Lorem
    1. Dolor
    2. Sit
• Ipsum

If I use the attached document as a source for testing, I am able to reproduce the issue. However, if I create a new list with the same structure, the issue does not occur.

I guess, something wrong happened with the existing list in the Word. I can't reproduce the issue when I create a fresh list.

[Reinmar]

Could you check this in CKEditor 4? If that works there, then perhaps we need to change the way how we process nested lists in PFO in CKE5.

[mmichaelis]

Comparing

• CKEditor 4 Demo - The battle-tested WYSIWYG HTML editor
• CKEditor 5 demo - A set of ready to use rich text editors created with a powerful framework

CKEditor 4 works without problems regarding the given example document (created with MS Office 365, if it matters). CKEditor 5 demo still shows the described problem.

[jodator]

Findings from the other PR: #8390 (comment) & the rest of the conversation.