Prevent map from stealing ListView scrolls

src/MissionEditor/MissionEditor.qml

@@ -359,6 +359,14 @@ QGCView {
                     opacity:        _rightPanelOpacity
                     z:              QGroundControl.zOrderTopMost
 
+                    MouseArea {
+                        // This MouseArea prevents the Map below it from getting Mouse events. Without this
+                        // things like mousewheel will scroll the Flickable and then scroll the map as well.
+                        anchors.fill:       parent
+                        preventStealing:    true
+                        onWheel:            wheel.accepted = true
+                    }
+
                     ListView {
                         anchors.fill:   parent
                         spacing:        _margin / 2