Adding virtual function

[John Tapsell]

Hi,
  I want to add a virtual function "doDrag()" to khtmlPart which is called 
when a drag is performed.  This is so that apps like kopete can override what 
happens when you drag an image.  (Kopete wants to replace latex images with 
the formula they represent.  See bug 88750)

  I have the code just sitting here ready to commit, but I think I cannot make 
BiC changes right?

Thanks,

JohnFlux