Fix off by one error in wxTextCtrl::GetLineLength() in wxOSX.

The trailing new line shouldn't be counted in the line length.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68464 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/textctrl_osx.cpp

@@ -775,9 +775,10 @@ int wxTextWidgetImpl::GetLineLength(long lineNo) const
             count = 0;
             for (size_t j = i; j < content.length(); j++)
             {
-                count++;
                 if (content[j] == '\n')
                     return count;
+
+                count++;
             }
 
             return count;