Pass project to TrackShifter factory, which LabelTrackShifter will need

src/menus/ClipMenus.cpp

@@ -627,10 +627,10 @@ void DoCursorClipBoundary
 }
 
 // This function returns the amount moved.  Possibly 0.0.
-double DoClipMove
-   ( ViewInfo &viewInfo, Track *track,
+double DoClipMove( AudacityProject &project, Track *track,
      TrackList &trackList, bool syncLocked, bool right )
 {
+   auto &viewInfo = ViewInfo::Get(project);
    auto &selectedRegion = viewInfo.selectedRegion;
 
    if (track) {
@@ -642,7 +642,7 @@ double DoClipMove
 
       // Find the first channel that has a clip at time t0
       for (auto channel : TrackList::Channels(track) ) {
-         uShifter = MakeTrackShifter::Call( *track );
+         uShifter = MakeTrackShifter::Call( *track, project );
          if( uShifter->HitTest( t0 ) == TrackShifter::HitTestResult::Miss )
             uShifter.reset();
          else
@@ -653,7 +653,7 @@ double DoClipMove
          return 0.0;
       auto pShifter = uShifter.get();
 
-      state.Init( *track, std::move( uShifter ),
+      state.Init( project, *track, std::move( uShifter ),
          t0, viewInfo, trackList, syncLocked );
 
       auto desiredT0 = viewInfo.OffsetTimeByPixels( t0, ( right ? 1 : -1 ) );
@@ -700,7 +700,7 @@ void DoClipLeftOrRight
    auto &tracks = TrackList::Get( project );
    auto isSyncLocked = settings.IsSyncLocked();
 
-   auto amount = DoClipMove( viewInfo, trackFocus.Get(),
+   auto amount = DoClipMove( project, trackFocus.Get(),
         tracks, isSyncLocked, right );
 
    window.ScrollIntoView(selectedRegion.t0());

src/tracks/playabletrack/notetrack/ui/NoteTrackView.cpp

@@ -760,7 +760,7 @@ private:
 
 using MakeNoteTrackShifter = MakeTrackShifter::Override<NoteTrack>;
 template<> template<> auto MakeNoteTrackShifter::Implementation() -> Function {
-   return [](NoteTrack &track) {
+   return [](NoteTrack &track, AudacityProject&) {
       return std::make_unique<NoteTrackShifter>(track);
    };
 }

src/tracks/playabletrack/wavetrack/ui/WaveTrackView.cpp

@@ -1458,7 +1458,7 @@ private:
 
 using MakeWaveTrackShifter = MakeTrackShifter::Override<WaveTrack>;
 template<> template<> auto MakeWaveTrackShifter::Implementation() -> Function {
-   return [](WaveTrack &track) {
+   return [](WaveTrack &track, AudacityProject&) {
       return std::make_unique<WaveTrackShifter>(track);
    };
 }

src/tracks/ui/TimeShiftHandle.cpp

@@ -252,12 +252,13 @@ bool CoarseTrackShifter::SyncLocks()
 }
 
 template<> auto MakeTrackShifter::Implementation() -> Function {
-   return [](Track &track) {
+   return [](Track &track, AudacityProject&) {
       return std::make_unique<CoarseTrackShifter>(track);
    };
 }
 
 void ClipMoveState::Init(
+   AudacityProject &project,
    Track &capturedTrack,
    std::unique_ptr<TrackShifter> pHit,
    double clickTime,
@@ -285,7 +286,7 @@ void ClipMoveState::Init(
    for ( auto track : trackList.Any() ) {
       auto &pShifter = state.shifters[track];
       if (!pShifter)
-         pShifter = MakeTrackShifter::Call( *track );
+         pShifter = MakeTrackShifter::Call( *track, project );
    }
 
    // Analogy of the steps above, but with TrackShifters, follows below
@@ -459,7 +460,7 @@ UIHandle::Result TimeShiftHandle::Click
 
    bool captureClips = false;
 
-   auto pShifter = MakeTrackShifter::Call( *pTrack );
+   auto pShifter = MakeTrackShifter::Call( *pTrack, *pProject );
 
    if (!event.ShiftDown()) {
       TrackShifter::HitTestParams params{
@@ -481,7 +482,7 @@ UIHandle::Result TimeShiftHandle::Click
       // As in the default above: just do shifting of one whole track
    }
 
-   mClipMoveState.Init( *pTrack,
+   mClipMoveState.Init( *pProject, *pTrack,
       captureClips ? std::move( pShifter ) : nullptr,
       clickTime,
 

src/tracks/ui/TimeShiftHandle.h

@@ -183,7 +183,7 @@ private:
 
 struct MakeTrackShifterTag;
 using MakeTrackShifter = AttachedVirtualFunction<
-   MakeTrackShifterTag, std::unique_ptr<TrackShifter>, Track>;
+   MakeTrackShifterTag, std::unique_ptr<TrackShifter>, Track, AudacityProject&>;
 
 class ViewInfo;
 
@@ -192,6 +192,7 @@ struct ClipMoveState {
    
    //! Will associate a TrackShifter with each track in the list
    void Init(
+      AudacityProject &project,
       Track &capturedTrack, //<! pHit if not null associates with this track
       std::unique_ptr<TrackShifter> pHit, /*!<
          If null, only capturedTrack (with any sister channels) shifts, as a whole */