Bug 36672 call hierarchy: Should show a progress bar
The Call Hierarchy view should show a progress bar when searching for callers/callees, allowing the user to abort the search.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
* Method setMethod.
     * @param method
     */
    public void setMethod(IMethod method) {
        if (method == null) {
            showPage(PAGE_EMPTY);
            return;
        }
        if ((method != null) && !method.equals(fShownMethod)) {
            addHistoryEntry(method);
        }
        this.fShownMethod = method;
        refresh();
    }
    public IMethod getMethod() {
        return fShownMethod;
    }
    public MethodWrapper getCurrentMethodWrapper() {
        if (fCurrentCallMode == CALL_MODE_CALLERS) {
            return fCallerRoot;
        } else {
            return fCalleeRoot;
        }
    }
           
    /**
     * called from ToggleOrientationAction.
     * @param orientation VIEW_ORIENTATION_HORIZONTAL or VIEW_ORIENTATION_VERTICAL
     */
    void setOrientation(int orientation) {