New Class dialog improvements

[Victor Röder]

Hi,

>Hello,
>I've made some improvements for the "New Class" dialog in cppsupport part.
>Changes are related to multiple inheritance (shown on the screenshot).
>
>Please take look on patches. If there is no objections, I can commit.
>
>  
>
Ah, cool!
 From my side, just go ahead.

Bye,
    Victor

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