alow Polyline position edit

src/MissionManager/QGCMapPolylineVisuals.qml

@@ -146,12 +146,26 @@ Item {
             visible:        removeVertexItem.visible
         }
 
+        MenuItem {
+            text:           qsTr("Edit position..." )
+            onTriggered:    qgcView.showDialog(editPositionDialog, qsTr("Edit Position"), qgcView.showDialogDefaultWidth, StandardButton.Cancel)
+        }
+
         MenuItem {
             text:           qsTr("Load KML...")
             onTriggered:    kmlLoadDialog.openForLoad()
         }
     }
 
+    Component {
+        id: editPositionDialog
+
+        EditPositionDialog {
+            Component.onCompleted: coordinate = mapPolyline.path[menu._removeVertexIndex]
+            onCoordinateChanged:  mapPolyline.adjustVertex(menu._removeVertexIndex,coordinate)
+        }
+    }
+
     Component {
         id: polylineComponent