Balloon toolbar overflows outside the editor

[kubaklatt]

📝 Provide detailed reproduction steps (if any)

1. Open the prepared sample to reproduce the issue: issue.zip

(This is a classic editor sample generated from the builder with a balloon toolbar, only the editor height has been changed and a header has been added)

2. Bring up the balloon toolbar and scroll the content down

✔️ Expected result

The balloon toolbar remains within the boundaries of the editor and does not overflow outside of it.

❌ Actual result

The balloon toolbar extends beyond the boundaries of the editor and overflows outside of it.

📃 Other details

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

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