request: option to display message edits with old and new separatedly

[kyranet]

Is your feature request related to a problem? Please describe.

Sometimes, the displayed difference between two messages is incredibly hard to read, and as such, some users prefer to have the original contents without mixing them.

Describe the solution you'd like

An option which displays the messages separatedly.

Describe alternatives you've considered

Using ANSI to use background colours to show the difference while also keeping markdown intact.

Additional context

#114 in #suggestions