Added Delete member to wxStringHashTable in order to implement

wxHelpProvider::RemoveHelp, which is now called from ~wxWindowBase.
Without cleaning up the hash tables, reused window addresses will cause
the CS help to fail rather comically over time.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15754 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cshelp.h

@@ -124,6 +124,9 @@ public:
     // the application, for example)
     virtual void AddHelp(wxWindowID id, const wxString& text);
 
+    // removes the association
+    virtual void RemoveHelp(wxWindowBase* window);
+
     // virtual dtor for any base class
     virtual ~wxHelpProvider();
 
@@ -142,6 +145,7 @@ public:
     virtual bool ShowHelp(wxWindowBase *window);
     virtual void AddHelp(wxWindowBase *window, const wxString& text);
     virtual void AddHelp(wxWindowID id, const wxString& text);
+    virtual void RemoveHelp(wxWindowBase* window);
 
 protected:
     // we use 2 hashes for storing the help strings associated with windows