Hide popup icon until mouseover

src/QmlControls/QGCPipable.qml

@@ -128,7 +128,7 @@ Item {
         fillMode:       Image.PreserveAspectFit
         anchors.left:   parent.left
         anchors.top:    parent.top
-        visible:        !isHidden && !inPopup && !ScreenTools.isMobile && enablePopup
+        visible:        !isHidden && !inPopup && !ScreenTools.isMobile && enablePopup && pipMouseArea.containsMouse
         height:         ScreenTools.defaultFontPixelHeight * 2.5
         width:          ScreenTools.defaultFontPixelHeight * 2.5
         sourceSize.height:  height