tx state history - append note to first op of diff

app/scripts/lib/tx-state-history-helper.js

@@ -20,8 +20,11 @@ function migrateFromSnapshotsToDiffs(longHistory) {
   )
 }
 
-function generateHistoryEntry(previousState, newState) {
+function generateHistoryEntry(previousState, newState, note) {
-  return jsonDiffer.compare(previousState, newState)
+  const entry = jsonDiffer.compare(previousState, newState)
+  // Add a note to the first op, since it breaks if we append it to the entry
+  if (note && entry[0]) entry[0].note = note
+  return entry
 }
 
 function replayHistory(shortHistory) {