e34359b921
This fixes a crash when SSL's channelstrip calls set-selection early on during session load, during Session::load_routes. Session::add_routes_inner calls calls ARDOUR::GUIIdle() which can trigger a SSL Native Channel Strip 2" VST3 to call VST3PI::setContextInfoValue, which in turn emits a CoreSelection::send_selection_change before the session is fully loaded. This also handles various edge cases where a given AC may not [yet] exist.
Please see the Ardour web site at https://ardour.org/ for all documentation..
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https://ardour.org/development.html