From Bertrand:

 - Allow to drag and drop any object that has a default constructor
   (required by TBufferFile) but is not a TFolder and not a TClass
   (to avoid dragging ROOT class from list of classes) from TBrowser.
 - Added check (obj->IsA()->GetMethodAllAny("Draw")) in method
   HandleDNDdrop() of TRootCanvas and TRootEmbeddedCanvas
   before calling obj->Draw().


git-svn-id: http://root.cern.ch/svn/root/trunk@18620 27541ba8-7e3a-0410-8455-c3a389f83636