Minor fixes to wxRichTextCtrlXmlHandler code and docs

Fix the example showing how to use it in the docs.

Don't use "maxlength" property for this control, as it's ignored by it
anyhow.

Closes #22467.

docs/doxygen/overviews/xrc_format.h

@@ -1930,19 +1930,17 @@ a single wxSizer child with non-ribbon windows in it.
 @hdr3col{property, type, description}
 @row3col{value, @ref overview_xrcformat_type_text,
     Initial value of the control (default: empty).}
-@row3col{maxlength, integer,
-    Maximum length of the text entered (default: unlimited).}
 @endTable
 
-Notice that wxRichTextCtrl support in XRC is available in wxWidgets 2.9.5 and
+Notice that you need to explicitly register the handler using
-later only and you need to explicitly register its handler using
 @code
     #include <wx/xrc/xh_richtext.h>
 
-    AddHandler(new wxRichTextCtrl);
+    AddHandler(new wxRichTextCtrlXmlHandler);
 @endcode
 to use it.
 
+@since 2.9.5
 
 @subsubsection xrc_wxscrollbar wxScrollBar
 

misc/schema/xrc_schema.rnc

@@ -1404,8 +1404,7 @@ wxRichTextCtrl =
         attribute class { "wxRichTextCtrl" } &
         stdObjectNodeAttributes &
         stdWindowProperties &
-        [xrc:p="o"] element value     {_, t_text }* &
+        [xrc:p="o"] element value {_, t_text }*
-        [xrc:p="o"] element maxlength {_, t_integer }*
     }
 
 

src/xrc/xh_richtext.cpp

@@ -24,7 +24,9 @@ wxRichTextCtrlXmlHandler::wxRichTextCtrlXmlHandler() : wxXmlResourceHandler()
     XRC_ADD_STYLE(wxTE_PROCESS_TAB);
     XRC_ADD_STYLE(wxTE_MULTILINE);
     XRC_ADD_STYLE(wxTE_READONLY);
-    XRC_ADD_STYLE(wxTE_AUTO_URL);
+
+    XRC_ADD_STYLE(wxRE_CENTRE_CARET);
+    XRC_ADD_STYLE(wxRE_READONLY);
 
     AddWindowStyles();
 }
@@ -43,9 +45,6 @@ wxObject *wxRichTextCtrlXmlHandler::DoCreateResource()
 
     SetupWindow(text);
 
-    if (HasParam(wxT("maxlength")))
-        text->SetMaxLength(GetLong(wxT("maxlength")));
-
     return text;
 }