Missing tooltip for split button's down arrow

[mlewand]

📝 Provide detailed reproduction steps (if any)

1. Open document editor example.
2. Hover the pointer over down arrow of the bulleted list button.

✔️ Expected result

It should show a tooltip like it does for the button's face. It helps to understand the purpose of a button.

❌ Actual result

The tooltip is missing.

📃 Other details

The question is how should the tooltip act on it?

• Should a separate tooltip (with the same text) be applied to both parts of the split button?
• Should the tooltip be shared by button's face and the down arrow icon?

Gdocs implement a separate tooltip for both.

• Browser: Any
• OS: Any
• First affected CKEditor version: All

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[mlewand]

The question is how should the tooltip act on it?

• Should a separate tooltip (with the same text) be applied to both parts of the split button?
• Should the tooltip be shared by button's face and the down arrow icon?

I did a quick research on this:

	Hovering/focusing button face	Hovering/focusing arrow part
MS Word
GDocs
Other WYSIWYGs

It's safe to say that most commonly we see a separate label for button face and the dropdown arrow. I also feel like it will be the list amount of work for us - so let's have it implemented this way.