[Delivers #25161819] fixed grid lines when walking diagonal, the player speed was set to sqrt(8) = 2.83 which means the player was walking at most 2.83 px/frame in each of the x and y directions resulting in a movement of 4 pixel-sized units diagonally. This was handled nicely by Chrome but not well by Firefox and Safari. The speed was changed to the nearest whole number (3) for the best of both worlds.
[Delivers #25161819] fixed grid lines
when walking diagonal, the player speed was set to
sqrt(8) = 2.83 which means the player was walking at most
2.83 px/frame in each of the x and y directions resulting
in a movement of 4 pixel-sized units diagonally. This was handled
nicely by Chrome but not well by Firefox and Safari. The speed was
changed to the nearest whole number (3) for the best of both worlds.

quinkennedy/Firefly