Fixed issue where the "Set Circle Radius" menu entry was trying to affect the...

Fixed issue where the "Set Circle Radius" menu entry was trying to affect the visibility of an item within a component.

src/MissionManager/QGCMapPolygonVisuals.qml

@@ -38,6 +38,7 @@ Item {
     property var    _centerDragHandleComponent
     property bool   _circle:                    false
     property real   _circleRadius
+    property bool   _editCircleRadius:          false
 
     property real _zorderDragHandle:    QGroundControl.zOrderMapItems + 3   // Highest to prevent splitting when items overlap
     property real _zorderSplitHandle:   QGroundControl.zOrderMapItems + 2
@@ -224,7 +225,7 @@ Item {
         MenuItem {
             text:           qsTr("Set radius..." )
             visible:        _circle
-            onTriggered:    radiusDialog.visible = true
+            onTriggered:    _editCircleRadius = true
         }
 
         MenuItem {
@@ -460,18 +461,17 @@ Item {
 
             function setRadiusFromDialog() {
                 setCircleRadius(mapPolygon.center, radiusField.text)
-                radiusDialog.visible = false
+                _editCircleRadius = false
             }
 
             Rectangle {
-                id:                 radiusDialog
                 anchors.margins:    _margin
                 anchors.left:       parent.right
                 width:              radiusColumn.width + (_margin *2)
                 height:             radiusColumn.height + (_margin *2)
                 color:              qgcPal.window
                 border.color:       qgcPal.text
-                visible:            false
+                visible:            _editCircleRadius
 
                 Column {
                     id:                 radiusColumn