Failure to paste content from word with list style disabled via inline style

[bendemboski]

📝 Provide detailed reproduction steps (if any)

1. Copy all of the content from this word document
2. Paste it into an editor with the paste from office plugin enabled, e.g. the classic demo

✔️ Expected result

Content appears in editor

❌ Actual result

Nothing appears in editor and the following exception is thrown:

Uncaught CKEditorError: unexpected-error {"originalError":{"message":"Cannot read property '2' of null","stack":"TypeError: Cannot read property '2' of null\n    at ib (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:576129)\n    at https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:575075\n    at eb (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:575158)\n    at hb.execute (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:579948)\n    at nh.t.plugins.get.on.priority (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:580355)\n    at nh.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128164)\n    at ro.listenTo.priority (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:423188)\n    at ro.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128164)\n    at ro.i (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:421444)\n    at ro.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128164)","name":"TypeError"}}
    at Function.rethrowUnexpectedError (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:3929)
    at nh.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128401)
    at ro.listenTo.priority (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:423188)
    at ro.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128164)
    at ro.i (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:421444)
    at ro.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128164)
    at eh.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:207744)
    at eh.onDomEvent (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:422142)
    at lr.listenTo.useCapture (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:207655)
    at lr.fire (https://ckeditor.com/assets/libs/ckeditor5/15.0.0/ckeditor.js:5:128164)

📃 Other details

• MS Word version: 16.30
• OS: OSX

It looks like the issue is that the second paragraph has a numbered list style applied, but list numbering is disabled via an inline style. This comes across the clipboard as

<p class=Customnumbered style='mso-list:none;tab-stops:.5in'>not numbered<o:p></o:p></p>

which causes this code to throw an exception since the mso-list is set to none, which the regex doesn't match.

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[bendemboski]

Pull request with fix here