Deprecate wxTipProvider::PreprocessTip().

It is completely useless, and there is no reason to keep it.

Closes #15916.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75744 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/tipdlg.h

@@ -44,14 +44,15 @@ public:
     // from where to start the next time)
     size_t GetCurrentTip() const { return m_currentTip; }
 
-    // Allows any user-derived class to optionally override this function to
-    // modify the tip as soon as it is read. If return wxEmptyString, then
-    // the tip is skipped, and the next one is read.
-    virtual wxString PreprocessTip(const wxString& tip) { return tip; }
-
     // virtual dtor for the base class
     virtual ~wxTipProvider() { }
 
+
+#ifdef WXWIN_COMPATIBILITY_3_0
+    wxDEPRECATED_MSG("this method does nothing, simply don't call it")
+    wxString PreprocessTip(const wxString& tip) { return tip; }
+#endif
+
 protected:
     size_t m_currentTip;
 };