better duration guessing by using fractions directly, at least from split

engine/items.py

@@ -367,7 +367,7 @@ class Duration(object):
                     return None
 
         durList = [D1024, D512, D256, D128, D64, D32, D16, D8, D4, D2, D1, DB, DL, DM]
-        guessedBase = _closest(completeDuration, durList)
+        guessedBase = _closest(completeDuration, durList)        
 
         if guessedBase:
             if completeDuration in durList:  #no need for guessing
@@ -378,10 +378,13 @@ class Duration(object):
             elif completeDuration/1.5/1.5 in durList:  #double dots
                 new = cls(completeDuration/1.5/1.5)
                 new.dots = 2
+            elif completeDuration *3/2 in durList:  #triplets are so a common we take care of them instead of brute forcing with fractions in the else branch
+                new = cls(guessedBase)
+                new.tuplets = [(2,3)]
             else: #tuplet. That means the value is below a standard "notehead" duration. We need to find how much much lower.
                 new = cls(guessedBase)
-                #ratio = completeDuration / guessedBase #0.666~ for triplet
-                newRatio = Fraction(completeDuration, guessedBase).limit_denominator(100000) #protects 6 or 7 decimal positions
+                #ratio = completeDuration / guessedBase #0.666~ for triplet                
+                newRatio = Fraction(int(completeDuration), guessedBase).limit_denominator(100000) #protects 6 or 7 decimal positions
                 new.tuplets = [(newRatio.numerator, newRatio.denominator)]
         else:
             #the base could not be guessed. In this case we just create a non-standard note.
@@ -1330,8 +1333,9 @@ class Chord(Item):
         oldValues = []
         for note in self.notelist:
             oldValues.append(note.duration.copy()) #we don't actually need a copy since we create a new one. But better safe than sorry. This matches also the behaviour of the other duration change functions.
-            newTicks = note.duration.completeDuration() / newparts
-            note.duration = Duration.createByGuessing(newTicks)
+            complDur =  note.duration.completeDuration()
+            #newTicks = complDur / newparts
+            note.duration = Duration.createByGuessing(Fraction(complDur, newparts))
 
         #Now we have one note with the duration the user wants to have. Make n-1 copies-
         spawnedNotes = []