In Inkscape I am editing an SVG file (please click the Raw button to download; copyright CC-BY-SA by Denelson83).
I have defined a grid of 15 x 15 for the whole document and toggled the Snap bounding box corners button on the right.
I am trying to move everything to the left and to the top - so that the drawn black grid lines match the grid of my Inkscape document.
So I Edit - Select All in All Layers and drag with the mouse:
Unfortunately, the black lines do not move for some reason - please help: