make some QxtSpanSlider's methods virtual

[Former user]

Hello.

I need to implement some restrictions to QxtSpanSlider behaviour: I need to not allow slider handles to be closer to each other than some value I want to provide by myself. The simplest solution for me is to make setLowerValue|setUpperValue|setSpan in QxtSpanSlider virtual and implement needed logic in inherited class.

What do you think? Is it possible to make this functions virtual?

[Arvid Picciani]

of course it is. send a patch