This patch improves and polishes the new KScreen KCM's UI in a variety of ways. A picture
says a thousand words, so look at the pictures. :)
I agree that this part is rather confusing.
@romangg can confirm, but as far as I understand it, this is asking you whether you want the settings for the current display (resolution, rotation, etc) to always be applied whenever this display is in use, or only to take effect when this display is in the current display arrangement.
For example, maybe you want to rotate your laptop's screen only when it is plugged into an external display, so you can put the laptop vertically and have more vertical space.
If we can come up with a better way to express this, that would be awesome.