LivePreview should keep showing the currently shown page in the screen, even after the re-loading

<Issue>
Let's take SwipeView as an example.
If a user is editing the second page, which is not shown in the default screen and requires swiping to be visible, since QDS shows the default page every time the QML is re-loaded, it is impossible for the user to edit the second page while seeing it on LivePreview.

<Reproduction Step>
(1) Download and open the attached EMS.zipwith QDS 4.6.

(2) Open Craphs2DScreen.qml and start LivePreview

(3) Swipe the area in the right to show the second page in the SwipeView

(4) Edit the second GraphPanel starting at line 26, which causes a re-load on LivePreview and hides the GraphPanel you are editing.