Show open files / panes on the top of the tree view. This package aims to provide an alternative to the functionalities of tabs.
There are some theme-specific styling issues since this package is not official one and most of (maybe all) theme packages do not have any support.
Those problems cannot be solved in a generic way (as far as I know), however, there are patches prepared for some themes to fix them. Visit tree-view-panes style patches collection repository and try one out.
I recommend turning off "Auto Reveal" setting of the "tree-view" package, because it moves the tree view up and down and this might be a bit annoying when switching files from the tree view.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.