fix wxConfig::DeleteGroup() for arguments with trailing slash (replaces patch 1624589)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44126 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/confbase.h

@@ -225,7 +225,7 @@ public:
     // delete the group (with all subgroups)
   virtual bool DeleteGroup(const wxString& key) = 0;
     // delete the whole underlying object (disk file, registry key, ...)
-    // primarly for use by desinstallation routine.
+    // primarily for use by uninstallation routine.
   virtual bool DeleteAll() = 0;
 
   // options
@@ -254,6 +254,13 @@ protected:
   static bool IsImmutable(const wxString& key)
     { return !key.IsEmpty() && key[0] == wxCONFIG_IMMUTABLE_PREFIX; }
 
+  // return the path without trailing separator, if any: this should be called
+  // to sanitize paths referring to the group names before passing them to
+  // wxConfigPathChanger as "/foo/bar/" should be the same as "/foo/bar" and it
+  // isn't interpreted in the same way by it (and this can't be changed there
+  // as it's not the same for the entries names)
+  static wxString RemoveTrailingSeparator(const wxString& key);
+
   // do read/write the values of different types
   virtual bool DoReadString(const wxString& key, wxString *pStr) const = 0;
   virtual bool DoReadLong(const wxString& key, long *pl) const = 0;