[skip ci] another corner case

Breeder/BR_EnvelopeUtil.cpp

@@ -2961,10 +2961,15 @@ void CalculateSplitMiddlePoints (double* time1, double* time2, double* bpm1, dou
 	WritePtr(bpm2, val2);
 }
 
-void InitTempoMap ()
+bool InitTempoMap ()
 {
 	if (!CountTempoTimeSigMarkers(NULL))
+  {
 		SetTempoTimeSigMarker(NULL, -1, 0, -1, -1, GetProjectSettingsTempo(NULL, NULL), 0, 0, false);
+    return true;
+  }
+  else
+    return false;
 }
 
 void RemoveTempoMap ()

Breeder/BR_EnvelopeUtil.h

@@ -300,7 +300,7 @@ double CalculateMeasureAtPosition (double startBpm, double endBpm, double timeLe
 double CalculatePositionAtMeasure (double startBpm, double endBpm, double timeLen, double targetMeasure);
 void CalculateMiddlePoint (double* middleTime, double* middleBpm, double measure, double startTime, double endTime, double startBpm, double endBpm);
 void CalculateSplitMiddlePoints (double* time1, double* time2, double* bpm1, double* bpm2, double splitRatio, double measure, double startTime, double middleTime, double endTime, double startBpm, double middleBpm, double endBpm);
-void InitTempoMap ();  // will make sure there's at least one point in tempo map (we can't manipulate tempo map's chunk (i.e. insert new points) if there isn't at least one point in tempo map)
+bool InitTempoMap ();  // will make sure there's at least one point in tempo map (we can't manipulate tempo map's chunk (i.e. insert new points) if there isn't at least one point in tempo map)
 void RemoveTempoMap ();
 void UnselectAllTempoMarkers ();
 void UpdateTempoTimeline (); // UpdateTimeline() isn't enough after changing tempo points through chunk - call this instead

Breeder/BR_Tempo.cpp

@@ -344,13 +344,21 @@ static HCURSOR MoveGridCursor (COMMAND_T* ct, int window)
  */
 static bool EnsureTempoSet(int id)
 {
+      char debugStr[256];
+      snprintf(debugStr, sizeof(debugStr), "EnsureTempoSet: id: %d\n", id);
+			OutputDebugString(debugStr);
+
 	double timeposOut, beat, bpm;
 	int measure, num, den;
 	bool linear;
-	GetTempoTimeSigMarker(NULL, id, &timeposOut, &measure, &beat, &bpm, &num, &den, &linear);
-	//TODO is there any way to tell whether bpm has already been explicitly set by this point?
-	SetTempoTimeSigMarker(NULL, id, timeposOut, measure, beat, bpm, num, den, linear);
-	return true;
+	if(GetTempoTimeSigMarker(NULL, id, &timeposOut, &measure, &beat, &bpm, &num, &den, &linear))
+  {
+    SetTempoTimeSigMarker(NULL, id, timeposOut, measure, beat, bpm, num, den, linear);
+    //TODO is there any way to tell whether bpm has already been explicitly set by this point?
+    return true;
+  }
+  else
+    return false;
 }
 
 static void MoveGridToMouse (COMMAND_T* ct)
@@ -367,16 +375,16 @@ static void MoveGridToMouse (COMMAND_T* ct)
 		s_lastPosition = 0;
 
 		// Make sure tempo map already has at least one point created (for some reason it won't work if creating it directly in chunk)
-		if (cmd != MOVE_CLOSEST_TEMPO_MOUSE)
-		{
-			InitTempoMap();
-			g_didTempoMapInit = true;
-		}
+    g_didTempoMapInit = InitTempoMap();
 
 		g_moveGridTempoMap = new (nothrow) BR_Envelope(GetTempoEnv());
 
 		// Make sure previous point is editable via g_moveGridTempoMap.
-		if (g_moveGridTempoMap && cmd != MOVE_CLOSEST_TEMPO_MOUSE)
+    // FIXME in MOVE_CLOSEST_TEMPO_MOUSE, we need the prev point relative to
+    // the closest point to be matched, not relative to the mouse.
+    // eg.,   4/4      12bpm      <cursor>
+    //        ^--this needs tempo
+		if (g_moveGridTempoMap && g_moveGridTempoMap->CountPoints())
 		{
 			// ensure previous point's bpm is explicitly set, otherwise changes won't register in BR_Envelope.
 			if(EnsureTempoSet(g_moveGridTempoMap->FindPrevious(PositionAtMouseCursor(true))))