fixed issue with fader group and mute state, added comments, update

ChangeLog

@@ -22,8 +22,10 @@
 
 TODO grouping does not work as expected:
      - vertical space between check boxes should be smaller
+     - update help text
 
 TODO minimum height of faders (dependent on style)
+     - startup height of main windows should be higher now
 
 
 

src/audiomixerboard.cpp

@@ -412,6 +412,7 @@ void CChannelFader::SendFaderLevelToServer ( const int iLevel,
                                 bIsGroupUpdate,
                                 iLevel - iPreviousFaderLevel );
 
+        // update previous fader level since the level has changed
         iPreviousFaderLevel = iLevel;
     }
 }
@@ -441,6 +442,12 @@ void CChannelFader::SetMute ( const bool bState )
         {
             // mute was unchecked, get current fader value and apply
             emit gainValueChanged ( CalcFaderGain ( GetFaderLevel() ), bIsMyOwnFader, false, 0 );
+
+// 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).
+            iPreviousFaderLevel = GetFaderLevel();
         }
     }
 }