[RFR] Fix CodeMirror filling.

[jarovo]

Purpose of intent

Some time ago, the CodeMirror component used for entering yaml templates started failing to get filled by selenium. There are currently two ON_QA bugs related to CodeMirror but even with them "fixed" I either did get indenting wrong (which is significant for yamls) or nothing else than parentheses { being input.

This PR set's the content of the CM using Javascript. Perhaps not ideal, but surely good enough to have the tests working.

PRT failures advocacy.

From first glance the errors on PRT are not related. The tests have not been executed for a while or were executed failing on the CodeMirror. I think most of them belong to @niyazRedhat. Niyaz, can you take a look?

{{ pytest: --use-sprout -s --sprout-group downstream-511z -sv 'cfme/tests/services/test_provision_stack.py' -v --use-provider 'complete' --long-running }}

[mshriver]

The unblocked tests in PRT have a 50% pass rate (2/4) The two test failures do not look related to the codemirror filling.

[niyazRedhat]

LGTM! thanks for the PR

[tpapaioa]

I think an easier way to avoid the auto-aligning of yaml content might be to select json in the radio button above the Content field. When that option is selected, no formatting is automatically applied to what you enter, so you can continue to use send_keys() instead of using javascript.

[jarovo]

I think an easier way to avoid the auto-aligning of yaml content might be to select json in the radio button above the Content field. When that option is selected, no formatting is automatically applied to what you enter, so you can continue to use send_keys() instead of using javascript.

Well, perhaps not selecting json and filling the field with yaml does not have some other effect, it doesn't seem right to me. If it was the other way around -- filing with json while the field is yaml should work as yaml is supposed to be superset of json.

Figuring out the javascript way took me a while, but I think it is pretty straight-forward in the end.