+#ifdef __WXGTK20__
+ if (m_windowStyle & wxTE_MULTILINE)
+ {
+ int last_line = gtk_text_buffer_get_line_count( m_buffer ) - 1;
+ if (lineNo > last_line)
+ return -1;
+
+ GtkTextIter iter;
+ gtk_text_buffer_get_iter_at_line(m_buffer, &iter, lineNo);
+ // get_chars_in_line return includes paragraph delimiters, so need to subtract 1 IF it is not the last line
+ return gtk_text_iter_get_chars_in_line(&iter) - ((lineNo == last_line) ? 0 : 1);
+ }
+ else
+#endif
+ {
+ wxString str = GetLineText (lineNo);
+ return (int) str.Length();
+ }