Bug 36487 call hierarchy: drop should set input
dropping a method to the call hierarchy view should have the same effect as 'focus on'
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
locationSelectionChanged(e.getSelection());
        }
    }
    /**
     * @param selection
     */
    private void locationSelectionChanged(ISelection selection) {}
    /**
     * @param selection
     */
    private void methodSelectionChanged(ISelection selection) {
        if (selection instanceof IStructuredSelection) {
            Object selectedElement = ((IStructuredSelection) selection).getFirstElement();
            if (selectedElement instanceof MethodWrapper) {
                MethodWrapper methodWrapper = (MethodWrapper) selectedElement;
                revealElementInEditor(methodWrapper, fCallHierarchyViewer);
                updateLocationsView(methodWrapper);
            } else {
                updateLocationsView(null);
            }
        }
    }
    private void revealElementInEditor(Object elem, Viewer originViewer) {
        
        
        if (getSite().getPage().getActivePart() != this) {
            return;
        }
        if (fSelectionProviderMediator.getViewerInFocus() != originViewer) {
            return;