Default shortcut for zoom 1:1 is '1'. The shortcuts are now global, which
is fab. However if one renames a layer, one cannot enter '1' on the
non-numeric part of the keyboard. To reproduce

1) create new image
2) zoom to 2:1
2) try doubleclick the 'Background' label of a layer in the layer dock
3) try renaming to 'test1'. Once you press the '1' key on the non-numeric
part of the kbd, the image zooms to 1:1.

The problem is even more annoying if one sets up custom shortcuts for more
zoom levels like I have ('2' for 2:1 etc).