Modifying mixed content in EditMOM3 leads to duplication of content

[NTsch]

Deletion of mixed content (text and child elements) in the editor window leads to the duplication of text contents, see for example this video.

The cause seems to be in the replaceMixedSelection function in the XPath module, specifically this line:

copyFlag ? result += ch : null;

Fixing this could be quite involved. So far, using only backspace for deletions, as opposed to marking and deleting mixed content, seems to be a viable workaround.