I find the current way of highlighting selected thumbnails in lighttable (elegant-grey-theme) a bit hard to see: it is a shade of grey just a bit lighter than the non-selected images. Is there a quick way to tweak the interface to make it more evident (e.g. maybe making the background of each thumbnail light yellow or orange, or even just changing the color of the outer frame of the thumbnail)? I know that the elegant-grey interface aims at making the working environment less likely to introduce biases in evaluating contrast and color, but this would only affect the lighttable, where no editing is done.