Option for Full Page Viewer ("ModalView"): LastGeneratedImage or CurrentPreviewImage

[tonmischa]

Hi guys,
in 1.7.0 RC you changed the behaviour for the full page viewer ("modalview").
show the preview image in the modalview if available #13459

In 1.6 the ModalView always showed the last generated Image while the new one was being generated.
In 1.7 it always shows the CurrentPreview.

I really enjoyed the opportunity to look at the last picture in detail while the new one is being rendered.
Is it possible to have an option to get the 1.6-Behaviour back? Without being forced to turn LivePreviews off?

Thank you!

[w-e-w]

PR #14230

[Zyin055]

I hope the PR gets added because the new 1.7 functionality prevents me from using one of my custom extensions effectively.