When searching for the controller for a command in nsWindowRoot::GetControllerForCommand, look for a focused browsing context instead and get the controller through the Controllers actor associated with that browsing context. When a command update occurs in a window in the child process, send the list of commands to the parent process along with the browsing context for that window. The parent will pass this information to the controllers actor. As long as we can get the right currently focused browsing context descendant, we can get the correct command state and invoke commands through the right actor.
Differential Revision: https://phabricator.services.mozilla.com/D66222
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rename : toolkit/modules/RemoteController.jsm => toolkit/actors/ControllersParent.jsm
extra : moz-landing-system : lando
Neil Deakin