Remove unused TrackPanel::MakeParentModifyState

src/TrackPanel.cpp

@@ -516,11 +516,6 @@ void TrackPanel::OnPaint(wxPaintEvent & /* event */)
 #endif
 }
 
-void TrackPanel::MakeParentModifyState(bool bWantsAutoSave)
-{
-   ProjectHistory::Get( *GetProject() ).ModifyState(bWantsAutoSave);
-}
-
 void TrackPanel::MakeParentRedrawScrollbars()
 {
    mListener->TP_RedrawScrollbars();

src/TrackPanel.h

@@ -145,9 +145,6 @@ public:
    wxRect FindTrackRect( const Track * target );
 
 protected:
-   void MakeParentModifyState(bool bWantsAutoSave);    // if true, writes auto-save file. Should set only if you really want the state change restored after
-                                                               // a crash, as it can take many seconds for large (eg. 10 track-hours) projects
-
    // Get the root object defining a recursive subdivision of the panel's
    // area into cells
    std::shared_ptr<TrackPanelNode> Root() override;