5c4a2025f1
controllable->set_value() from GUI context will eventually queue a session-rt command. By the time the realtime command runs, the controllable needs to be in "touch" mode. The AutomationController "toggle" UI worked around this by directly using the underlying API (ignoring slaved-controls and ignoring groups). The RouteUI's GUI wasn't able to write mute-automation at all. This commit is a compromise: press + hold (touch) + release button. (it may need further special-casing for _desc.toggled in AutomationControl::actually_set_value(), also undoing automation-writes is currently not working correctly)
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