Temporary KColorScheme change - hard-code some state colors

[Luciano Montanaro]

>
> I'm not that opposed to what happens in my current build: the text and
> widgets become more gray, but the background stays the same.
> - the window doesn't flash
> - the window is still readable
> - yet it is clear which window is active and which is not
>
> Now, who can tell me what is wrong with that?

What's wrong is that large parts of the screen have to be redrawn for no real 
good reason...

That means that 
- Laptops will use more power
- Network sessions will be even more sluggish
- Slower machines will perform badly

In the end, it would give substance to the bloated KDE meme.