dist/images/spritesheet-2x.png has dimensions 540 x 60, but the image was being scaled to 210 x 30. This was causing toolbar icons to be rendered incorrectly in a retina display. Corrected scaling to 270 x 30.
$ file dist/images/spritesheet-2x.png
dist/images/spritesheet-2x.png: PNG image data, 540 x 60, 8-bit/color RGBA, non-interlaced
Fixed image size for retina spritesheet icons
Noticed the same, made the same fix to g-leaflet-draw project. Fix looks correct to me.
Nice catch @dwnoble , I must have messed up the maths when I added the new icons the the spritesheet.