This appears to be working in Windows. Not sure what the convention is in Linux. If this is the convention for OSX then @Scorp1us, I think you can just file a bug for this. This is a UX bug, not a feature request IMO.
That’s sort of a hack. I’d prefer if the behavior matched chrome, which has is own custom window title.
If I enable that setting, yeah, i get a OS window title bar., and it does work, but then that takes up additional space. Komodo should just support double clicking in the gray, like Chrome.