Extras like snap guidelines can be drawn for targets not yet clicked

src/TrackPanel.cpp

@@ -1906,8 +1906,9 @@ void TrackPanel::DrawEverythingElse(TrackPanelDrawingContext &context,
 #endif
    }
 
-   if (mUIHandle)
-      mUIHandle->DrawExtras(UIHandle::Cells, dc, region, clip);
+   auto target = Target();
+   if (target)
+      target->DrawExtras(UIHandle::Cells, dc, region, clip);
 
    // Paint over the part below the tracks
    trackRect.y += trackRect.height;
@@ -1929,8 +1930,8 @@ void TrackPanel::DrawEverythingElse(TrackPanelDrawingContext &context,
       HighlightFocusedTrack(dc, focusRect);
    }
 
-   if (mUIHandle)
-      mUIHandle->DrawExtras(UIHandle::Panel, dc, region, clip);
+   if (target)
+      target->DrawExtras(UIHandle::Panel, dc, region, clip);
 }
 
 // Make this #include go away!

src/UIHandle.h

@@ -89,6 +89,8 @@ public:
    // If pass is Cells, then any drawing that extends outside the cells
    // is later overlaid with the cell bevels and the empty background color.
    // Otherwise (Panel), it is a later drawing pass that will not be overlaid.
+   // This is invoked on the hit test target even before it is clicked,
+   // and also during drag.
    virtual void DrawExtras
       (DrawingPass pass,
        wxDC * dc, const wxRegion &updateRegion, const wxRect &panelRect);