Add wxTextEntryDialog::SetMaxLength().

Allow restricting the maximal number of characters that can be entered in
wxTextEntryDialog.

Closes #15158.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73832 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/textdlgg.h

@@ -62,6 +62,8 @@ public:
     void SetValue(const wxString& val);
     wxString GetValue() const { return m_value; }
 
+    void SetMaxLength(unsigned long len);
+
 #if wxUSE_VALIDATORS
     void SetTextValidator( const wxTextValidator& validator );
 #if WXWIN_COMPATIBILITY_2_8