Overlay scrollbars are invisible against a selected element

[Matthew Paul Thomas]

Problem occurs with: light-themes 0.1.8.21, Ubuntu Ocelot
Does not occur with: Windows 7, Mac OS X 10.7

1. In Ubuntu Software Center, navigate to a category that has enough items to scroll, such as "Accessories".
2. Try to tell whether you are seeing the complete list.

What happens:
* You can't tell, unless there happens to be a partly-visible item at the bottom of the window.
* There is a scrollbar, but it consists only of a Windows-Phone-style sliver in the selection color. And because it's on top of a selected item, it's utterly invisible.

What should happen: Scrollbars should not use a single solid color, and/or their primary color should be very different from the selection color.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Benjamin Bach (benjaoming)]

Same problem in both Ambiance and Radiance.

May I suggest the following solutions:

* Make a colour difference so the marker is clearly visible, even on top of a highlighted panel element.

* Make a margin between the highlighted panel element and the scroll bar.

* Ditch the puny scrollbar and make a solid and visible one. This would be an over-all improvement, as the scrollbar is often way too invisible. Some applications like Firefox and Thunderbird have their own scrollbars, even though using native widgets?