[da-anda]

just played with your changes. I don't like that my preferred stereo mode is changed when I change stereo mode while no movie is playing (system mode) - my preference is still the same and shouldn't change only because I switched to a different mode (like 2D) once. Also, the dialog "change of default stereo mode" is only shown if one switches from/to STEREO_MODE_OFF and not uses any of the next/prev/toggle2d actions to cycle between modes unless you hit STEREO_MODE_OFF again (I suppose the logic is wrongly inverted here because a switch between OFF and stereo mode won't change preferred mode, but all others).

Another thing that I really don't like is the location of the videos stereo settings in the videosettings dialog, for the simple reason that there is a "make these settings default for all videos" button which makes absolutely no sense for stereo settings. So we probably will need our own stereomode dialog I guess?

And again - "mono (2D)" is not a real stereo mode. Having it in the spinner for "preferred stereo mode" breaks the StereoToMono toggle/cAction which will switch between preferred/current stereo mode and 2D.