Bug 36616 Call hierarchy: clicking Show History button should show dialog
When clicking the "Show History List" button (not the drop down arrow) nothing happens. To be consistent with search and the type hierarchy a dialog with the full list should be shown.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/HistoryDropDownAction.java
public static final int RESULTS_IN_DROP_DOWN = 10;
    private CallHierarchyViewPart fView;
    private Menu fMenu;
    public HistoryDropDownAction(CallHierarchyViewPart view) {
        fView = view;
        fMenu = null;
        setToolTipText(CallHierarchyMessages.getString("HistoryDropDownAction.tooltip")); 
        JavaPluginImages.setLocalImageDescriptors(this, "history_list.gif"); 
        WorkbenchHelp.setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_HISTORY_DROP_DOWN_ACTION);
        setMenuCreator(this);
    }
    public Menu getMenu(Menu parent) {
        return null;
    }
    public Menu getMenu(Control parent) {
        if (fMenu != null) {
            fMenu.dispose();
        }