Hi there.

I've encountered a bug with theme handling on Mac, I think this is a bug (on mac atleast).

theme_tab_background will restart tiling every tab, unless I specify an image for theme_frame.

So say I have a theme_tab_background with a width of 1024, and a theme_frame with a width of 1024. If I omit theme_frame, the width of theme_tab_background becomes the width of the inactive tab, and starts the repeat with every single tab.