Lighttable view: keyboard shortcuts for zoom in/zoom out
In the lighttable view, number of images in a row can be changed by Ctrl+mouse wheel. Ctrl+mouse wheel is frequently used as zoom in/zoom out command in many applications. Actually, lowering the number of images in a row is zoom in, and increasing number of images is zoom out, so darktable just follows the common approach.
In most of the applications zoom in/zoom out operations can also be performed by Ctrl-+ and Ctrl-- keyboard shortcuts. (Probably, Ctrl-+ should be better spelled as Ctrl-=.) Unfortunately, these widely used shortcuts do not work in darktable.
Thus, in would be nice to have Ctrl-+ and Ctrl-- shortcuts for zoom in/zoom out in the lighttable view.