On 5 Oct 2018, at 14:59, Ronald Wampler wrote:

I should mention that the current way we handle the styling for the tabs (as
NSImages) is not optimal since it doesn’t support desktop tint. The only way
I know how to properly support it is to add the tab bar as an accessory view
in the title bar (API 10.10) and change the `OakTabBarStyle` to use NSColor
instead of NSImage images.

I will drop 10.9 compatibility for the reworked file browser (next build), so I see no problem switching from images to colors for the tab bar (as you probably know, the images were to support the 10.9 tab look).