White Box on Timeline

[esDotDev]

What is normally a white border with vertical dashed line, is rendering as a white square, only when using Impeller on a real device.

It seems to be caused by the simple:

Container(
  decoration: BoxDecoration(border: Border.all(color: borderColor))
)

Should be:

[bdero]

This should be fixed when flutter/engine#38146 lands.