Dark theme does not change the color of the window title bar

[manuelrn]

Dark theme does not change the color of the window title bar and its buttons (minimize, maximize and close). Ideally, this should change.

There are also 2 bars (above "Stream File" and "Codec") that are light colored and perhaps it would be nice to change them to a less light and less bright color, for example set them to the same gray color as the border of the 4 text areas.

Thank you very much!