May 21, 2018 at 9:28 am #23213
Yutaka Emura
Keymaster
These background/foreground-color-inversed characters are similar to caret notations except that carets are replaced with inversed representation. Please see :
https://en.wikipedia.org/wiki/Caret_notation
This way the control characters are readable while still preserving the width of each character.
Thanks,