Constant width display for network speed

[peterjobrien]

Propose having a fixed-width display for the network speed value.
Goal is to reduce visual distraction by making the display more stable.

Units would be selectable but not change during display.
Leading zeros are not displayed but the width is maintained.
Up/down arrows are in a fixed position either on the left or right.

Examples (selected Mbit/s):

  921.46 Mbit/s ↑
   32.08 Mbit/s ↓
↑   0.00 Mbit/s 
↓   0.04 Mbit/s 
    0.98 Mbit/s ↑
  210.40 Mbit/s ↓

In this case there are always 3 full number digits and two decimal digits. Could be 3-5 full number digits.