Alt-text button doesn't handle long locale strings "nicely"

[Snuffleupagus]

Attach (recommended) or Link to PDF file here: N/A

Configuration:

• Web browser and its version: N/A
• Operating system and its version: N/A
• PDF.js version: 4.0.242 [3459615]
• Is a browser extension: N/A

Steps to reproduce the problem:

1. Open the demo viewer, using a locale with longer strings than English, https://mozilla.github.io/pdf.js/web/viewer.html#locale=sv-SE
2. Add a StampAnnotation, e.g. firefox_logo.svg from the test-suite.
3. Rotate the document once. Edit: It also reproduces without rotating, simply by making the Annotation small enough.

What is the expected behavior? (add screenshot)
That the alt-text button has vertical padding, even when the alt-text string is longer than the default.

What went wrong? (add screenshot)
No vertical padding, with the localized alt-text reaching the borders of the button, when the alt-text string is split into multiple lines; see screen-shot below.
Edit: If the localized string is sufficiently long, I suppose that the text may even end up "outside" of the button.

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): N/A