The XML schema model editor uses GET method

[szakitibi]

What I did

Created an EasyForm with a lot of question and fields with long descriptions. Clicking "Save" on the XML schema editor resulted an error.

What happens

Having a long EasyForm with a lot of fields with longer descriptions result the XML schema "Save" dropping:

Request-URI Too Long
The requested URL's length exceeds the capacity limit for this server.

What I expect

Being able to submit XML schema form with POST method.

collective.easyform/src/collective/easyform/browser/modeleditor.pt

Line 40 in 365a838

<form id="saveform"

[szakitibi]

The issue is reproducible on https://classic.demo.plone.org/en/demo/a-form/fields/@@modeleditor. The Too Long error starts when the XML goes above 32000 characters.