Make wxPreferencesEditor::Show() virtual.

This allows derived classes to override it to do something before/after
showing the dialog, which can be useful on the platforms where modal dialogs
are used for wxPreferencesEditor implementation.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74008 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/preferences.h

@@ -98,7 +98,7 @@ public:
     // Show the preferences dialog or bring it to the top if it's already
     // shown. Notice that this method may or may not block depending on the
     // platform, i.e. depending on whether the dialog is modal or not.
-    void Show(wxWindow* parent);
+    virtual void Show(wxWindow* parent);
 
     // Hide the currently shown dialog, if any. This doesn't do anything on the
     // platforms using modal preferences dialogs but should be called to

interface/wx/preferences.h

@@ -77,7 +77,7 @@ public:
         @param parent The window that invokes the preferences.
                       Call Dismiss() before it's destroyed.
      */
-    void Show(wxWindow* parent);
+    virtual void Show(wxWindow* parent);
 
     /**
         Hide the currently shown dialog, if any.