Merge pull request #2589 from DonLakeFlyer/Mission

Mission changes

src/MissionEditor/MissionEditor.qml

@@ -600,7 +600,7 @@ QGCView {
 
         QGCViewMessage {
             id:         syncLoadFromVehicleCheck
-            message:   "Load vehicle check"
+            message:   "You have unsaved/unsent mission changes. Loading the mission from the Vehicle will lose these changes. Are you sure you want to load the mission from the Vehicle?"
 
             function accept() {
                 hideDialog()
@@ -614,7 +614,7 @@ QGCView {
 
         QGCViewMessage {
             id:         syncLoadFromVehicleCheck
-            message:   "Load file check"
+            message:   "You have unsaved/unsent mission changes. Loading a mission from a file will lose these changes. Are you sure you want to load a mission from a file?"
 
             function accept() {
                 hideDialog()

src/MissionManager/MissionManager.cc

@@ -182,8 +182,8 @@ void MissionManager::_readTransactionComplete(void)
     
     _vehicle->sendMessage(message);
     
-    emit newMissionItemsAvailable();
     _finishTransaction(true);
+    emit newMissionItemsAvailable();
 }
 
 void MissionManager::_handleMissionCount(const mavlink_message_t& message)