Scroll the agenda when using the wheel on the timelabels.

BUG: 292210
(cherry picked from commit 8c0a0f75)

calendarviews/eventviews/agenda/timelabelszone.cpp

@@ -99,8 +99,12 @@ void TimeLabelsZone::addTimeLabels( const KDateTime::Spec &spec )
 void TimeLabelsZone::setupTimeLabel( QScrollArea *area )
 {
   if ( mAgenda && mAgenda->verticalScrollBar() ) {
+    // Scrolling the agenda will scroll the timelabel
     connect( mAgenda->verticalScrollBar(), SIGNAL(valueChanged(int)),
              area->verticalScrollBar(), SLOT(setValue(int)) );
+    // and vice-versa. ( this won't loop )
+    connect( area->verticalScrollBar(), SIGNAL(valueChanged(int)),
+             mAgenda->verticalScrollBar(), SLOT(setValue(int)) );
 
     area->verticalScrollBar()->setValue( mAgenda->verticalScrollBar()->value() );