Fix temporary tempo item creation crash, also don't export them to lilypond anymore

CHANGELOG

@@ -34,6 +34,7 @@ Add preview image to Lilypond properties and metadata
 More information about the cursor and position in the status bar
 Fix all drawn items to properly work with high zoom-out levels. Side effect: slightly better performance.
 Better alignment for all drawn items.
+Fix temporary tempo item creation crash, also don't export them to lilypond anymore.
 Fix drawing of ties and staccato dots.
 Fix ledger lines of added chord notes
 Fix cursor jumping around on track change if you start near a metrical signature

engine/api.py

@@ -2420,7 +2420,7 @@ def deleteTempoBlock(tempoBlockId):
 def insertTempoItemAtAbsolutePosition(tickPositionAbsolute, unitsPerMinute, referenceTicks, graphType, description:str):
     blockId, blockPosition = session.data.tempoTrack.tempoBlocKByAbsolutePosition(tickPositionAbsolute)
     positionInTicksRelativeToBlock = tickPositionAbsolute - blockPosition
-    addTempoItem(blockId, positionInTicksRelativeToBlock, unitsPerMinute, referenceTicks, graphType, description)
+    return addTempoItem(blockId, positionInTicksRelativeToBlock, unitsPerMinute, referenceTicks, graphType, description)
 
 def tempoAtTickPosition(tick):
     tempoItem = session.data.tempoTrack.tempoAtTickPosition(tick)
@@ -2447,8 +2447,12 @@ def insertTempoChangeDuringDuration(percentageUnitsPerMinuteAsFloat):
         tempoItem = session.data.tempoTrack.tempoAtTickPosition(startTick)
         #originalUnitsPerMinute, originalReferenceTicks = session.data.tempoTrack.tempoAtTickPosition(startTick)
         newUnitsPerMinute = tempoItem.unitsPerMinute * percentageUnitsPerMinuteAsFloat
-        insertTempoItemAtAbsolutePosition(startTick, newUnitsPerMinute, tempoItem.referenceTicks, graphType = "standalone")
-        insertTempoItemAtAbsolutePosition(endTick, tempoItem.unitsPerMinute, tempoItem.referenceTicks, graphType = "standalone")
+        t = insertTempoItemAtAbsolutePosition(startTick, newUnitsPerMinute, tempoItem.referenceTicks, graphType = "standalone", description="tmp")
+        t.lilypondParameters["hide"] = True #Replace with Fermata or so
+        t = insertTempoItemAtAbsolutePosition(endTick, tempoItem.unitsPerMinute, tempoItem.referenceTicks, graphType = "standalone", description="tmp") # a tempo
+        t.lilypondParameters["hide"] = True
+
+
 
 def currentTempoScalingFactor():
     return session.data.tempoTrack.factor

engine/tempotrack.py

@@ -48,7 +48,10 @@ class TempoItem(object):
         self.unitsPerMinute = round(unitsPerMinute)
         self.referenceTicks = round(referenceTicks)
         self.graphType = "standalone" #options: linear, standalone
-        self.lilypondParameters = {"tempo": description} #for example 'Allegro' or 'Ein bischen schneller'. Only strings are allowed.
+        self.lilypondParameters = {
+            "tempo": description, #for example 'Allegro' or 'Ein bischen schneller'. Only strings are allowed.
+            "hide" : False, #True will skip ly-export, for fermatas and other temporary changes.
+            }
         self._secondInit(parentBlock = None)
 
     def _secondInit(self, parentBlock):
@@ -65,6 +68,8 @@ class TempoItem(object):
         self.referenceTicks = int(serializedObject["referenceTicks"])
         self.graphType = serializedObject["graphType"]
         self.lilypondParameters = serializedObject["lilypondParameters"]
+        if not "hide" in self.lilypondParameters: #Version 2.1.0
+            self.lilypondParameters["hide"] = False
         self._secondInit(parentBlock = parentObject)
         return self
 
@@ -688,6 +693,10 @@ class TempoTrack(GraphTrackCC):
     def lilypond(self):
         """Based on the static export"""
         def _ly(tempoItem, nextTempoItem):
+
+            if tempoItem["lilypondParameters"]["hide"]:
+                return ""
+
             if tempoItem["graphType"] in ("standalone", "linear"):
                 ramp = ""
                 if not tempoItem["graphType"] == "standalone":