Usability idea: Use draw-call thumbnails as framebuffer whilst retrieving framebuffer

We already have low-resolution thumbnails for every single draw call (as seen by hovering mouse over the thumbnail).

When you click on a draw call that hasn't been replayed before, why don't we show this low-resolution one in the meantime and blend to the high resolution when it's finished loading? Right now you just see a spinning icon and an empty screen, this would be super nice when just clicking through draw calls.