voc2gui: Retake button in lecture mode might be active but not doing anything

[schmittlauch]

I discovered that in lecture mode, the retake button might be active but clicking it won't do anything. This is not severe but a bit confusing.

How to reproduce

1. Lecture composite, channel A = slides, channel B = any camera (Cam1 or Cam2)
2. cut (or trans) to switch that configuration to live
3. retake
4. observation: now retake button is (correctly) inactive
5. change selected camera of channel B
6. observation: retake button is active again…
7. … but clicking it does nothing.

version: Whatever Voc2Mix was deployed at Datenspuren 2022