#23 button-bg color does not work

[Aaron Fischer]

If I choose a different color for the button-bg color, the whole tabbar is filled with this color. This looks not very good and it is also not the right color (the empty tabbar can't be clicked).

Furthermore, the tab itself is not filled correctly with the color (see second screenshot).

[Ralf Hoffmann]

This problem has been fixed in final release 3.5.0