Tracker is Haiku's main user interface and file browser/manager.

Tracker has a navigation bar with next/previous/parent buttons to navigate the filesystem (this is optional and not enabled by default). These buttons are currently drawn as bitmaps, with two unwanted consequences:

* They look ugly and use an old icon style

* They are not scalable

Modify Tracker code to use vector icons instead. You can use the arrow icons from zuMi's BToolbar set (http://zumi.xoom.it/myhaiku/btoolbar/index.html). Vector icons are decoded using the BIconUtils class in Haiku to convert them into a BBitmap.