wrapping that goes wrong (removes comment marker)

[ArntWork]

When selecting all this text:

  int aa = 0; // test line 1 test line 1 test line 1 test line 1 test line 1 test line 1
  // test line2 test line2 test line2 test line2
  // test line3

with wrapping set at line 100, and using 'warp paragraph to column', this is the result:

  int aa = 0; // test line 1 test line 1 test line 1 test line 1 test line 1 test line 1 test
  line2 test line2 test line2 test line2 test line3

I know the starting situation is a bit strange, and so I have no preference for what would be the 'best' wrapping outcome here, but at least each line should have // at the start.