Compare contents - highlighted as different parts which are not different

[Damel]

Image: https://i.ibb.co/DgWkbdJ/Compare-content.png

Please, why is part ".B" highlighted as different when this part of the line is the same in both compared files?
Even after editing Sync:3 method.

Ad the 3rd part of the picture:
After ticking [ON] the "Show only differences, with extra lines", the right side becomes 'selected' and the is no way to unselect it back (except by jumping into the Edit mode and back).

[ghisler(Author)]

It's described in the help:

if there was a difference, a search was made for at least 3 matching characters

A.B and D.B would not match the .B because it is too short.
A.BB and D.BB would match the .BB because it's 3 characters long.

This is done to better find inserted/deleted words instead of just characters.

[ghisler(Author)]

Moderator message

Moved to "will not be changed"