fix: if group, set one fader to 0, set mute, move fader up, unmute -> no grouping anymore

ChangeLog

@@ -10,7 +10,6 @@
 - bug fix: grouping faders in the client should be proportional (see discussion in #202, #419)
 
 
-TODO fix: if group, set one fader to 0, set mute, move fader up, unmute -> no grouping anymore
 
 TODO bug fix: incorrect selection of UI language (#408) !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
      -> note that for the 3.5.8 bug fix release we went back to the original translation code (e.g. no pt_BR!)

src/audiomixerboard.cpp

@@ -455,12 +455,6 @@ void CChannelFader::SetMute ( const bool bState )
         {
             // mute was unchecked, get current fader value and apply
             emit gainValueChanged ( CalcFaderGain ( GetFaderLevel() ), bIsMyOwnFader, false, false, -1 ); // set level ratio to in invalid value
-
-// TODO When mute or solo is activated, the group synchronization does not work anymore.
-//      To get a smoother experience, we adjust the previous level as soon as the mute is
-//      again set to off (if we would not do that, on the next move of the fader the other
-//      faders in the group would jump which is very bad).
-            dPreviousFaderLevel = GetFaderLevel();
         }
     }
 }