Large PHPdoc unreadable due to missing scrollbar

### Apache NetBeans version

Apache NetBeans 16

### What happened

Ctrl+hover shows relevant PHPdoc, but almost always without scrollbars, although strictly needed, and thereby making the functionality nearly useless as half the content is missing necessitating Googling for it instead.

I have, rarely, seen scrollbars - so, they do exist and work when present - but do not have a working example to give currently.

The cut part also exists as you can run your cursor there with arrow keys - however, that does not cause scrolling either.

### How to reproduce

Check for help on any lengthy php function, ex:

```

Start by reproducing the issue in the PHP editor with Ctrl-hover on preg_replace_callback() and other lengthy PHP functions. Inspect the documentation popup behavior in cases where a scrollbar appears and where it does not. Done means lengthy PHPdoc is fully readable and keyboard navigation scrolls the hidden content.

Written by the indexing model from the issue text.