kis_custom_image_widget.h - mostly empty derived class

[Foss Phreak]

Hi,

In the file kis_custom_image_widget.h I see that the class WdgNewImage is
very minimal, and that another class KisCustomImageWidget is derived from
it and does most of the actual work. Can anyone please tell me why this is
so? Is there some benefit or is it just a cleaner/better design?

Thanks,
fossphreak
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