Origin: upstream, commit:c9f84a4f5c1b959326276e88d480a550d2f10b67
Author: James Thistlewood <jamesthistlewood@gmail.com>
Description: fix #290323: synthesizer state duplicated when changing score with saved state

--- a/libmscore/synthesizerstate.cpp
+++ b/libmscore/synthesizerstate.cpp
@@ -42,6 +42,7 @@ void SynthesizerState::write(XmlWriter&
 
 void SynthesizerState::read(XmlReader& e)
       {
+      std::list<SynthesizerGroup> tempGroups;
       while (e.readNextStartElement()) {
             SynthesizerGroup group;
             group.setName(e.name().toString());
@@ -54,7 +55,12 @@ void SynthesizerState::read(XmlReader& e
                   else
                         e.unknown();
                   }
-            push_back(group);
+            tempGroups.push_back(group);
+            }
+
+      if (!tempGroups.empty()) {
+            // Replace any previously set state if we have read a new state
+            swap(tempGroups);
             setIsDefault(false);
             }
       }