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I didn't realize that i can toggle word wrap for every single text_line_control. As word wrap is still useless in this context it is not an issue anymore.
This got even more important since navigating the sidebar with the keyboard is possible. Here you have to step over every file in the sidebar to navigate somewhere. 
This is the file preview feature (not a bug). If you start editing the file it becomes its own tab, at least for me (version 2063).