Revert "Bug 1823: Better interaction of undo and record..."

This reverts commit 1e8aba968d, reversing
changes made to 6e75ae58ac.

src/toolbars/ControlToolBar.cpp

@@ -958,11 +958,24 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
       shifted = !shifted;
 
    TrackList *trackList = p->GetTracks();
+   auto pTracksCopy = TrackList::Create();
+   auto &tracksCopy = *pTracksCopy;
+   bool tracksCopied = false;
 
    WaveTrackArray recordingTracks;
 
    auto cleanup = finally( [&] {
       if (!success) {
+         if (tracksCopied)
+            // Restore the tracks to remove any inserted silence
+            *trackList = std::move(tracksCopy);
+
+         if ( ! shifted ) {
+            // msmeyer: Delete recently added tracks if opening stream fails
+            for ( auto track : recordingTracks )
+               trackList->Remove(track.get());
+         }
+
          SetPlay(false);
          SetStop(false);
          SetRecord(false);
@@ -1009,13 +1022,13 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
 #ifdef EXPERIMENTAL_MIDI_OUT
          midiTracks = trackList->GetNoteTrackArray(false);
 #endif
-      }
+     }
       else {
          playbackTracks = WaveTrackConstArray();
 #ifdef EXPERIMENTAL_MIDI_OUT
          midiTracks = NoteTrackArray();
 #endif
-      }
+     }
 
       // If SHIFT key was down, the user wants append to tracks
       int recordingChannels = 0;
@@ -1063,23 +1076,14 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
                t1 = wt->GetEndTime();
                // less than or equal, not just less than, to ensure a clip boundary.
                // when append recording.
-
-               // A function that copies all the non-sample data between
-               // wave tracks; in case the track recorded to changes scale
-               // type (for instance), during the recording.
-               auto updater = [](Track &d, const Track &s){
-                  auto &dst = static_cast<WaveTrack&>(d);
-                  auto &src = static_cast<const WaveTrack&>(s);
-                  dst.Reinit(src);
-               };
-
-               // Get a copy of the track to be appended, to be pushed into
-               // undo history only later.
-               auto pending = std::static_pointer_cast<WaveTrack>(
-                  p->GetTracks()->RegisterPendingChangedTrack(
-                     updater, wt.get() ) );
-
                if (t1 <= t0) {
+                  if (!tracksCopied) {
+                     // Duplicate all tracks before modifying any of them.
+                     // The duplicates are used to restore state in case
+                     // of failure.
+                     tracksCopied = true;
+                     tracksCopy = *trackList;
+                  }
 
                   // Pad the recording track with silence, up to the
                   // maximum time.
@@ -1087,10 +1091,10 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
                   newTrack->SetWaveColorIndex( wt->GetWaveColorIndex() );
                   newTrack->InsertSilence(0.0, t0 - t1);
                   newTrack->Flush();
-                  pending->Clear(t1, t0);
-                  pending->Paste(t1, newTrack.get());
+                  wt->Clear(t1, t0);
+                  wt->Paste(t1, newTrack.get());
                }
-               recordingTracks.push_back(pending);
+               recordingTracks.push_back(wt);
                // Don't record more channels than configured recording pref.
                if( (int)recordingTracks.size() >= recordingChannels ){
                   break;
@@ -1126,9 +1130,7 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
          wxString baseTrackName = recordingNameCustom? defaultRecordingTrackName : defaultTrackName;
 
          for (int c = 0; c < recordingChannels; c++) {
-            std::shared_ptr<WaveTrack> newTrack{
-               p->GetTrackFactory()->NewWaveTrack().release()
-            };
+            auto newTrack = p->GetTrackFactory()->NewWaveTrack();
 
             newTrack->SetOffset(t0);
             wxString nameSuffix = wxString(wxT(""));
@@ -1180,8 +1182,11 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
                newTrack->SetChannel( Track::MonoChannel );
             }
 
-            p->GetTracks()->RegisterPendingNewTrack( newTrack );
-            recordingTracks.push_back( newTrack );
+            // Let the list hold the track, and keep a pointer to it
+            recordingTracks.push_back(
+               Track::Pointer<WaveTrack>(
+                  trackList->Add(
+                     std::move(newTrack))));
          }
       }
 
@@ -1207,8 +1212,6 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
          StartScrollingIfPreferred();
       }
       else {
-         CancelRecording();
-
          // Show error message if stream could not be opened
          ShowErrorDialog(this, _("Error"),
                          _("Error opening sound device.\nTry changing the audio host, recording device and the project sample rate."),
@@ -1450,15 +1453,3 @@ void ControlToolBar::StopScrolling()
       project->GetPlaybackScroller().Activate
          (AudacityProject::PlaybackScroller::Mode::Off);
 }
-
-void ControlToolBar::CommitRecording()
-{
-   const auto project = GetActiveProject();
-   project->GetTracks()->ApplyPendingTracks();
-}
-
-void ControlToolBar::CancelRecording()
-{
-   const auto project = GetActiveProject();
-   project->GetTracks()->ClearPendingTracks();
-}

src/toolbars/ControlToolBar.h

@@ -112,12 +112,6 @@ class ControlToolBar final : public ToolBar {
    void StartScrolling();
    void StopScrolling();
 
-   // Commit the addition of temporary recording tracks into the project
-   void CommitRecording();
-
-   // Cancel the addition of temporary recording tracks into the project
-   void CancelRecording();
-
  private:
 
    AButton *MakeButton(teBmps eEnabledUp, teBmps eEnabledDown, teBmps eDisabled,