List view with a class name is always split into multiple lists

[mlewand]

📝 Provide detailed reproduction steps (if any)

I was adding support for ol[class] attribute, so I added a listItem[listClass] attribute (similarly as we keep listType)

 in the model.

However, when downcasting each list item gets placed in a separate list, while all should be placed in a single list wrapper. Note the numbering being restart:

Interestingly if I change view attribute name from class to something else, e.g. data-class it works as expected and no multiple lists are created.

I created a demo:

• https://codepen.io/mlewand/pen/MWjQjeR - list is downcasted to ul[class] and gets split into separate lists.
• https://codepen.io/mlewand/pen/oNzEzWB - the same as above except downcast is done to ul[data-class] attribute (just different attribute name) - and it works fine.

✔️ Expected result

List should not be split.

❌ Actual result

List is being split.

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