feat(tracker): change keyboard shortcuts to mimic old trackers

tracker/model.go

@@ -36,7 +36,6 @@ type (
 		ChangedSinceSave        bool
 		RecoveryFilePath        string
 		ChangedSinceRecovery    bool
-		Loop                    Loop
 	}
 
 	Model struct {
@@ -59,6 +58,7 @@ type (
 		recording    bool
 		playing      bool
 		playPosition sointu.SongPos
+		loop         Loop
 		noteTracking bool
 		quitted      bool
 
@@ -132,7 +132,6 @@ const (
 	ScoreChange
 	BPMChange
 	RowsPerBeatChange
-	LoopChange
 	SongChange ChangeType = PatchChange | ScoreChange | BPMChange | RowsPerBeatChange
 )
 
@@ -156,7 +155,7 @@ const maxUndo = 64
 func (m *Model) AverageVolume() Volume        { return m.avgVolume }
 func (m *Model) PeakVolume() Volume           { return m.peakVolume }
 func (m *Model) PlayPosition() sointu.SongPos { return m.playPosition }
-func (m *Model) Loop() Loop                   { return m.d.Loop }
+func (m *Model) Loop() Loop                   { return m.loop }
 func (m *Model) PlaySongRow() int             { return m.d.Song.Score.SongRow(m.playPosition) }
 func (m *Model) ChangedSinceSave() bool       { return m.d.ChangedSinceSave }
 func (m *Model) Dialog() Dialog               { return m.dialog }
@@ -183,7 +182,7 @@ func NewModelPlayer(synther sointu.Synther, recoveryFilePath string) (*Model, *P
 		modelMsgs:       modelMessages,
 		synther:         synther,
 		song:            m.d.Song.Copy(),
-		loop:            m.d.Loop,
+		loop:            m.loop,
 		avgVolumeMeter:  VolumeAnalyzer{Attack: 0.3, Release: 0.3, Min: -100, Max: 20},
 		peakVolumeMeter: VolumeAnalyzer{Attack: 1e-4, Release: 1, Min: -100, Max: 20},
 	}
@@ -244,9 +243,6 @@ func (m *Model) change(kind string, t ChangeType, severity ChangeSeverity) func(
 			if m.changeType&RowsPerBeatChange != 0 {
 				m.send(RowsPerBeatMsg{m.d.Song.RowsPerBeat})
 			}
-			if m.changeType&LoopChange != 0 {
-				m.send(m.d.Loop)
-			}
 			m.undoSkipCounter++
 			var limit int
 			switch m.changeSeverity {
@@ -322,7 +318,6 @@ func (m *Model) UnmarshalRecovery(bytes []byte) {
 	}
 	m.d.ChangedSinceRecovery = false
 	m.send(m.d.Song.Copy())
-	m.send(m.d.Loop)
 	m.updatePatternUseCount()
 }
 
@@ -402,7 +397,6 @@ func (m *Model) resetSong() {
 	}
 	m.d.FilePath = ""
 	m.d.ChangedSinceSave = false
-	m.d.Loop = Loop{}
 }
 
 // send sends a message to the player