CKBox command should (allow to) set focus in the opened dialog

[mlewand]

📝 Provide detailed reproduction steps (if any)

1. Open v38.0.1 sample with CKBox
2. Evaluate following code in js console: window.setTimeout( () => editor.execute('ckbox'), 5000 ).
3. make sure to move back your browser focus back the editor
4. wait till dialog opens
5. type random words

✔️ Expected result

Your window focus should go to CKBox dialog (your keyboard actions should be handled by CKBox).

❌ Actual result

Your focus is still in editor, thus you're changing the content of the editor.

❓ Possible solution

If you have ideas, you can list them here. Otherwise, you can delete this section.

📃 Other details

This issue is mostly visible if you're opening CKBox with slash commands:

1. Go to https://ckeditor.com/docs/ckeditor5/38.0.1/examples/builds-custom/full-featured-editor.html
2. Focus editor and clear its content.
3. type /uplo (should yield upload command).
4. Accpet it.

You expect your focus to be moved to CKBox.

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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