Invalid cell property after pasting a table to the editor from Word

[Mgsy]

📝 Provide detailed reproduction steps (if any)

1. Open the sample Word document from our documentation.
2. Select the table and copy it.
3. Paste the table to the editor, e.g. in the Paste from Word demo.
4. Put the caret in the first cell.
5. Open the table cell properties window.

✔️ Expected result

It displays correct values.

❌ Actual result

The border color field has windowtext value and is highlighted as invalid.

📃 Other details

It's not a regression.

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[Reinmar]

CKE4: ckeditor/ckeditor4#2923

[Reinmar]

windowtext is listed in https://www.w3.org/TR/css-color-3/#:~:text=4.5.%20CSS%20system%20colors so we may add it to the list of valid colors (I suppose it's this: https://github.com/ckeditor/ckeditor5/blob/be2339d/packages/ckeditor5-engine/src/view/styles/utils.js#L24).

[arkflpc]

Shall we add all depreciated system colors from the spec?

[Reinmar]

Yes, I see no point in adding just one color. These are valid color values. They are deprecated (so we wouldn't use them), but we can accept them as values.

[Reinmar]

However, just to be sure: do you see a problem with adding all the colors?