I have gotten this far through the checklist.
About 2 1/2 months ago I issued a call for testing. I have not gotten any responses. I have asked the maintainer of the QXmlEdit project to see if he can engage his user community to see if they can test the snap.
There is only one outstanding issue that the PDF documentation does not open when the button for it is clicked. There is an issue for this on the project with more information on a related link in the QXmlEdit issue queue. It appears that this can only be solved if the project adds a way that a an environment variable would be read to tell the QXmlEdit where it can find the documentation file.
I am now asking for the transfer of frederickjh/qxmledit to snapcrafters.