autosave when exporting pdf and ly

engine/api.py

@@ -1719,7 +1719,8 @@ def insertMetricalInstruction(treeOfInstructions, lilypondOverride = None):
 def commonMetricalInstructionsAsList():
     """for musical reasons 5/4 and 7/8 and other a-symetrical
     metrical instructions cannot be in here since it is unknown which
-    internal version the user wants."""
+    internal version the user wants. And we don't want to pollute this with all possible
+    permutations like 5/4: 3+2+2;  5/4: 2+3+2 etc."""
     return [
         "off",
         "4/4",
@@ -2500,6 +2501,7 @@ def lilypondText(text):
         logger.error(err)
 
 def exportLilypond(absoluteFilePath):
+    save()
     lilypond.saveAsLilypond(session.data, absoluteFilePath)
     #try:
     #    lilypond.saveAsLilypond(session.data, absoluteFilePath)
@@ -2508,6 +2510,7 @@ def exportLilypond(absoluteFilePath):
 
 def showPDF():
     try:
+        save()
         lilypond.saveAsLilypondPDF(session.data, openPDF = True)
     except Exception as err:
         logger.error(err)