Bug
1579269 Part 2: Add a test of the inRDMPane property. r=mtigley
This test is setup to run both with and without the pref
"devtools.responsive.browserUI.enabled" set. Ideally, we can find a
way to refactor this structure into something that can be put into
devtools/client/responsive/test/browser/head.js, and other helper
functions in that file can be modified to work with the pref on or
off.
Differential Revision: https://phabricator.services.mozilla.com/D51022
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extra : moz-landing-system : lando