Bug 2422 - Append Recording always scrolls vertically to bottom track

Fix:
Move the scrolling to ProjectAudioManager::DoRecord(), where it's known whether the recording is appending to existing tracks or not.

src/ProjectAudioManager.cpp

@@ -733,6 +733,8 @@ bool ProjectAudioManager::DoRecord(AudacityProject &project,
          TrackList::Get( *p ).GroupChannels(*first, recordingChannels);
          // Bug 1548.  First of new tracks needs the focus.
          TrackFocus::Get(*p).Set(first);
+         if (TrackList::Get(*p).back())
+            TrackList::Get(*p).back()->EnsureVisible();
       }
 
       //Automated Input Level Adjustment Initialization

src/TrackPanel.cpp

@@ -280,8 +280,6 @@ TrackPanel::TrackPanel(wxWindow * parent, wxWindowID id,
          *this, std::move( pAx ) );
    }
 
-   mRedrawAfterStop = false;
-
    mTrackArtist = std::make_unique<TrackArtist>( this );
 
    mTimeCount = 0;
@@ -418,8 +416,6 @@ void TrackPanel::OnTimer(wxTimerEvent& )
    {
       projectAudioIO.SetAudioIOToken(0);
       window.RedrawProject();
-
-      mRedrawAfterStop = false;
    }
    if (mLastDrawnSelectedRegion != mViewInfo->selectedRegion) {
       UpdateSelectionDisplay();
@@ -438,20 +434,12 @@ void TrackPanel::OnTimer(wxTimerEvent& )
 
       // Periodically update the display while recording
 
-      if (!mRedrawAfterStop) {
-         mRedrawAfterStop = true;
-         MakeParentRedrawScrollbars();
-         mListener->TP_ScrollUpDown( 99999999 );
+      if ((mTimeCount % 5) == 0) {
+         // Must tell OnPaint() to recreate the backing bitmap
+         // since we've not done a full refresh.
+         mRefreshBacking = true;
          Refresh( false );
       }
-      else {
-         if ((mTimeCount % 5) == 0) {
-            // Must tell OnPaint() to recreate the backing bitmap
-            // since we've not done a full refresh.
-            mRefreshBacking = true;
-            Refresh( false );
-         }
-      }
    }
    if(mTimeCount > 1000)
       mTimeCount = 0;

src/TrackPanel.h

@@ -202,13 +202,6 @@ protected:
 
    bool mRefreshBacking;
 
-#ifdef EXPERIMENTAL_SPECTRAL_EDITING
-
-protected:
-
-#endif
-
-   bool mRedrawAfterStop;
 
 protected: