Raise::Yes did nothing while Firefox was not the active application, where GTK
activates through gtk_window_present_with_time. Only nsFocusManager::RaiseWindow
reaches this on macOS, after BrowsingContext::CanFocusCheck grants the raise,
and mozilla.widget.raise-on-setfocus is a kill switch. The mac arms un-skipped
here are the browser-chrome harness waiting forever for a focus event once the
Browser Toolbox has taken activation: Bug 1937229, Bug 1937315, Bug 1767721,
Bug 1781499.
Differential Revision: https://phabricator.services.mozilla.com/D325018
Florian Quèze
66f7f4704b