NW.Js export improvements; Bug fixes.
Huh, I didn't know the black bars needed redrawing too. Has anyone ever reported these problems to Valve? In my view they really should be fixed by Steam, since adding weird compatibility hacks can cause their own problems, especially with these command line switches (Google could remove them at some point, there isn't any support guarantee for those).
That's a known issue that Electron suffers from as well (any Chromium wrapper). I'm pretty sure I've seen it being reported years ago with no response. Might be worth creating a new issue on crbugs by you guys because Valve sure won't care.