Unable to copy text from row editor non-editable celll

To reproduce:

• open a segment for editing
• copy a few words of the source segment
• try to enter it into the search field of the concordance search. This does not work. Yet it works to copy it to the target.

Additional info:

**This is general problem for non editable cell in the row editor. And the problem is an extj bug wich is fixed in the lattes extjs version.

With extjs 7 update, the workaround should be removed.