Initial and final newlines are missing from Block comments in the Context's Comment instances

[gilramir]

Initial and final newlines are missing from the data in the parser's Context data structure.

Given this input, for example:

  1 module Example exposing (..)
  2 
  3 x: Int
  4 x = 1
  5 
  6 {- Example 1
  7 Second line -}
  8 
  9 {-
 10 Example 2
 11 Second line -}
 12 
 13 {-
 14 Example 3
 15 Second Line
 16 -}
 17 

The Comment data for each example is:

Block <Example 1
Second line> @ row=6 col=1
Block <Example 2
Second line> @ row=9 col=1
Block <Example 3
Second Line> @ row=13 col=1

For Example 2, line 9 is the beginning of the comment, but the string "Example 2" actually starts on line 10.
For Example 3, we do not know that terminating "-}" is on a line by itself because the string "Second Line" doesn't have a terminating newline.

To reproduce:

1. Clone the repo at https://github.com/gilramir/gren-bug-reports
2. cd to the 2026-04-08-multiline-comment directory
3. run "./run.sh"