Bug 2493 - No command for setting multi-view

Bug 2460 - Enh: Can't select "Multi-view" as default view mode in Tracks preferences

This fixes both.

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

@@ -568,6 +568,7 @@ BEGIN_POPUP_MENU(WaveTrackMenuTable)
    };
 
    BeginSection( "SubViews" );
+
       // Multi-view check mark item, if more than one track sub-view type is
       // known
       Append( []( My &table ) -> Registry::BaseItemPtr {
@@ -622,6 +623,7 @@ BEGIN_POPUP_MENU(WaveTrackMenuTable)
                   menu.Enable( id, false );
             };
          };
+         if( id < OnSetDisplayId + 2  )
             Append( [type, id]( My &table ) -> Registry::BaseItemPtr {
                const auto pTrack = &table.FindWaveTrack();
                const auto &view = WaveTrackView::Get( *pTrack );
@@ -746,8 +748,16 @@ void WaveTrackMenuTable::OnSetDisplay(wxCommandEvent & event)
    const auto pTrack = static_cast<WaveTrack*>(mpData->pTrack);
 
    auto id = AllTypes()[ idInt - OnSetDisplayId ].id;
-
    auto &view = WaveTrackView::Get( *pTrack );
+
+   if (id == WaveTrackViewConstants::Multiview)
+   {
+      // Only set it to multiview, if not already multi view.
+      if( !view.GetMultiView() )
+         OnMultiView(event);
+      return;
+   }
+
    if ( view.GetMultiView() ) {
       for (auto channel : TrackList::Channels(pTrack)) {
          if ( !WaveTrackView::Get( *channel )

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

@@ -929,6 +929,12 @@ bool WaveTrackView::ToggleSubView(Display display)
 // Be sure the sequence in which the other views appear is determinate.
 void WaveTrackView::DoSetDisplay(Display display, bool exclusive)
 {
+   if (display == WaveTrackViewConstants::Multiview) {
+      SetMultiView(true);
+      display = WaveTrackViewConstants::Waveform;
+      exclusive = false;
+   }
+
    // Some generality here anticipating more than two views.
    // The order of sub-views in the array is not specified, so make it definite
    // by sorting by the view type constants.

src/tracks/playabletrack/wavetrack/ui/WaveTrackViewConstants.h

@@ -29,9 +29,11 @@ namespace WaveTrackViewConstants
       obsolete3, // was SpectralSelectionLogDisplay
       obsolete4, // was PitchDisplay
 
+      Multiview,
+
       // Add values here, and update MaxDisplay.
 
-      MaxDisplay = Spectrum,
+      MaxDisplay = Multiview,
 
       NoDisplay,            // Preview track has no display
    };

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

@@ -36,12 +36,18 @@ Paul Licameli split from WaveTrackView.cpp
 #include <wx/graphics.h>
 #include <wx/dc.h>
 
-static WaveTrackSubView::Type sType{
+static WaveTrackSubView::Type sTypeWave{
    WaveTrackViewConstants::Waveform,
    { wxT("Waveform"), XXO("Wa&veform") }
 };
 
-static WaveTrackSubViewType::RegisteredType reg{ sType };
+static WaveTrackSubView::Type sTypeMulti{
+   WaveTrackViewConstants::Multiview,
+   { wxT("Multiview"), XXO("&Multi-view") }
+};
+
+static WaveTrackSubViewType::RegisteredType regWave{ sTypeWave };
+static WaveTrackSubViewType::RegisteredType regMulti{ sTypeMulti };
 
 WaveformView::~WaveformView() = default;
 
@@ -128,7 +134,7 @@ void WaveformView::DoSetMinimized( bool minimized )
 
 auto WaveformView::SubViewType() const -> const Type &
 {
-   return sType;
+   return sTypeWave;
 }
 
 std::shared_ptr<TrackVRulerControls> WaveformView::DoGetVRulerControls()