Music web interface: Scroll bar disappears under status bar, possibly not all music visible

[RandolfCarter]

Expected behaviour

The scroll bar handle for a long music list should always be visible.

Actual behaviour

When on the top of the music list, the handle is not shown, only when scrolling down (e.g. via Mousewheel) it starts to appear from below the region above.

Steps to reproduce

1. Go to the music app
   1.5 (Wait for the music to load)
2. Check the scrollbar
3. If you have much music, there will be no scrollbar handle at first at all - the top region of the scroll bar is hidden behind the element above
4. Scroll down, the handle will get visible

Server configuration

Operating system: Ubuntu Server 12.04 x64
Web server: Apache 2.2.22
Database: MySQL 14.14 Distrib 5.5.29
PHP version: 5.4.13
ownCloud version: 5.0.5

Client configuration

Browser: Firefox 20.0
Operating system: Ubuntu 12.10 x64

Other Notes

I think I've seen other reports of this before but can't find them at the moment. This is what it looks like for me at the moment: Please note how the scrollbar handle disappears under the region where the "Rescan collection" button is located:

Possibly related:
#766

Web Developer Log

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[RandolfCarter]

Discovered more problematic Music app UI stuff.
It seems the left list (the play queue) can be scrolled in a way so that it covers the player controls (try turning the mouswheel when the mouse is over the controls).
Furthermore, when making the window sufficiently small, the "Rescan collection" button will be wrapped to the next line, covering some of the music in the list of available songs.
The UI will then look like this: