relying on engine.softTakeoverIgnoreNextValue() assumes that physical control is moved every time it switches to controlling another value

[mixxxbot]

Reported by: Be-ing
Date: 2016-03-31T22:44:14Z
Status: Confirmed
Importance: Medium
Launchpad Issue: lp1564644

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The recently introduced soft takeover mechanism requiring a call to engine.softTakeoverIgnoreNextValue() when a physical control such as a fader is switched to manipulating a different value in Mixxx generally works well. However, it does not work well when the physical control is switched between different modes without being moved. For example, a volume fader controlling [Channel1] could be moved all the way down, then the script switches it to controlling [Channel3] and calls engine.softTakeoverIgnoreNextValue('[Channel1]', 'volume'), then the script switches it back to controlling [Channel1] without the user moving the fader. In this situation, to use the fader to move the value of [Channel1], volume back up from 0, the fader on the controller has to be moved up, then down, then up again.