Delete-selection-mode is misused in haskell-indentation-delete-char #388
Description
In the function haskell-indentation-delete-char, delete-selection-mode is used to determine whether to delete the entire region if there is a mark set.
Delete selection mode is for deciding whether to remove the region when a region exists and any character is inserted.
I believe that a check for delete-selection-mode should be removed in haskell-indentation-delete-char, meaning that will always delete a region if the mark is active.