Bug: kupusilvatools.js: "Code source is not allowed inside a header" error

i was creating a new code source with LookupWindowField or  
ReferenceLookupWindowField. and then i was fighting with the error  
"Code source is not allowed inside a header". inside what header,  
please? i have the code source within the body. i also noted that i  
don't get the error all the times.

so here is my analysis which is hopefully too wrong;-)

i finally could figure out in which case i get an error and in which  
not. in kupu, a code source is represented with a line containing the  
title and a line containing the parameters and the yellow background.  
to edit the parameters of a code source, one has to click with the  
mouse somewhere in yellow area. at random one sometimes clicks on the  
line with the title and sometimes on the line with the parameters. and  
every time i click on the line with the title of the code source i get  
the "Code source is not allowed inside a header". no error when  
clicking on the parameter line.

the error probably lies in the  
SilvaExternalSourceTool.prototype.startExternalSourceAddEdit function  
in the javascript Silva/kupu/kupusilvatools.js. this function checks  
if you place a code source within a header or table which is not  
allowed. therefore, it verifies the parenting tags. and here lies the  
error: the paraenting tags are <h4></h4> in kupu when clicking in the  
line with the tile and this is not allowed and therefore the error.

SilvaExternalSourceTool.prototype.startExternalSourceAddEdit =  
function() {
     // you should not be allowed to add external sources inside
     // headers or table cells
     var selNode = this.editor.getSelectedNode();
     var not_allowed_parent_tags = ['H1', 'H2', 'H3', 'H4', 'H5', 'H6'];
     for (i=0; i < not_allowed_parent_tags.length; i++){
         if (selNode.tagName == not_allowed_parent_tags[i]){
             alert('Code source is not allowed inside a header.')
             return
         }
     }
     [snip]

to avoid this error selNode should not be the parant node but the  
great parent node which is the enclosing <div> of the code source:

<div parameter="value" class="externalsource" source_id="mycodesource">
<h4>Silva Code Source «foo»</h4> parameter: value<br></div>

if my analysis is correct a simple change in the line

     var selNode = this.editor.getSelectedNode();

should fix this error. i don't know javascript at all so i leave it to  
you developers;-)

regards,
marc