add const qualifiers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52414 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/richtext/richtexthtml.h

@@ -39,10 +39,10 @@ class wxRichTextHTMLHandler : public wxRichTextFileHandler
 {
 public:
     /**
-        , @b const wxString&@e ext = wxT("html"), @b int@e type = wxRICHTEXT_TYPE_HTML)
+        ,  wxString&@e ext = wxT("html"), @b int@e type = wxRICHTEXT_TYPE_HTML)
         Constructor.
     */
-    wxRichTextHTMLHandler();
+    wxRichTextHTMLHandler() const;
 
     /**
         Clears the image locations generated by the last operation.
@@ -75,12 +75,12 @@ public:
     /**
         Returns the directory used to store temporary image files.
     */
-    const wxString GetTempDir();
+    const wxString GetTempDir() const;
 
     /**
         Returns the image locations for the last operation.
     */
-    const wxArrayString GetTemporaryImageLocations();
+    const wxArrayString GetTemporaryImageLocations() const;
 
     /**
         Reset the file counter, in case, for example, the same names are required each