Add refresh_on_change attribute to header param to cut.xml (bgruening#1806)

This is needed to reliably provide the column names in the column selection menu, otherwise it will just display the columns of the previously selected dataset.

Author: hechth

tools/text_processing/text_processing/cut.xml

@@ -44,7 +44,7 @@
                     <option value="|">Pipe</option>
                 </param>
                 <conditional name="colnames_option">
-                    <param name="header" type="select" label="Is there a header for the data's columns ?">
+                    <param name="header" type="select" label="Is there a header for the data's columns ?" refresh_on_change="true">
                         <option value="Y">Yes</option>
                         <option value="N" selected="true">No</option>
                     </param>