Bug with template strings in js, ts

[artman]

Noticed a diffing problem with template strings in js and ts that peculiarly is changes on whether a newline is present or not

If you have the following original:

const CommentsContainer = styled(Flex)`
  width: 100%;
  margin-top: 16px;

  ${props => props.$withSeparator && 
   `padding-top: 22px;`
  }
`;

and this modified:

const CommentsContainer = styled(Flex)`
  width: 100%;
  margin-top: 16px;
`;

Difftastic won't recognize that the last three lines of the template string have been removed, but will mark the entire template string as changed.

However, if you just remove one newline in the original before the last closing bracket, difftastic recognizes the deletion correctly:

const CommentsContainer = styled(Flex)`
  width: 100%;
  margin-top: 16px;

  ${props => props.$withSeparator && 
   `padding-top: 22px;`}
`;

The same thing as a CLI screenshot:

[ptravers]

@Wilfred can I take this?