fix delete group

engine/api.py

@@ -570,32 +570,36 @@ def clearSwitchGroupTranspositions(startMeasureForGroup:int, endMeasureExclusive
     updatePlayback()
 
 def deleteSwitches(howMany, fromMeasureNumber):
+    """Parameters are un-multiplied measures."""
     for track in session.data.tracks:
+        thisTrackHowMany = howMany // track.patternLengthMultiplicator #integer division
+        thisTrackWhere = fromMeasureNumber // track.patternLengthMultiplicator #integer division
+
         new_structure = set()
 
         for switch in track.structure:
-            if switch < fromMeasureNumber:
+            if switch < thisTrackWhere:
                 new_structure.add(switch)
-            elif switch >= fromMeasureNumber+howMany: #like a text editor let gravitate left into the hole left by the deleted range
-                new_structure.add(switch-howMany)
+            elif switch >= thisTrackWhere+thisTrackHowMany: #like a text editor let gravitate left into the hole left by the deleted range
+                new_structure.add(switch-thisTrackHowMany)
             #else: #discard all in range to delete
         track.structure = new_structure
 
         new_scaleTransposed = dict()
         for k,v in track.whichPatternsAreScaleTransposed.items():
-            if k < fromMeasureNumber:
+            if k < thisTrackWhere:
                 new_scaleTransposed[k] = v
-            elif k >= fromMeasureNumber+howMany: #like a text editor let gravitate left into the hole left by the deleted range
-                new_scaleTransposed[k-howMany] = v
+            elif k >= thisTrackWhere+thisTrackHowMany: #like a text editor let gravitate left into the hole left by the deleted range
+                new_scaleTransposed[k-thisTrackHowMany] = v
             #else: #discard all in range to delete
         track.whichPatternsAreScaleTransposed = new_scaleTransposed
 
         new_halftoneTransposed = dict()
         for k,v in track.whichPatternsAreHalftoneTransposed.items():
-            if k < fromMeasureNumber:
+            if k < thisTrackWhere:
                 new_halftoneTransposed[k] = v
-            elif k >= fromMeasureNumber+howMany: #like a text editor let gravitate left into the hole left by the deleted range
-                new_halftoneTransposed[k-howMany] = v
+            elif k >= thisTrackWhere+thisTrackHowMany: #like a text editor let gravitate left into the hole left by the deleted range
+                new_halftoneTransposed[k-thisTrackHowMany] = v
             #else: #discard all in range to delete
         track.whichPatternsAreHalftoneTransposed = new_halftoneTransposed