feature request: image layers window hide

[Dmitry1987]

some feedback for this window:

it's really cool, but blocking. I think users would prefer to be able hide it (the "OK" was not hiding it in my case - don't know if it should?)

[Dmitry1987]

also the size of total image download is not shown, it might be good to add (in header for example)

[igor-lemon]

@Dmitry1987 Yep. We'll add function for download image in background mode also will add cancel of downloading.