blockinfile - Remove unused code for Ansible 1.x. (#75040)

changelogs/fragments/blockinfile-unused-code.yml

@@ -0,0 +1,2 @@
+minor_changes:
+   - blockinfile - Remove unused code for Ansible 1.x.

lib/ansible/modules/blockinfile.py

@@ -265,9 +265,6 @@ def main():
     marker0 = re.sub(b(r'{mark}'), b(params['marker_begin']), marker) + b(os.linesep)
     marker1 = re.sub(b(r'{mark}'), b(params['marker_end']), marker) + b(os.linesep)
     if present and block:
-        # Escape sequences like '\n' need to be handled in Ansible 1.x
-        if module.ansible_version.startswith('1.'):
-            block = re.sub('', block, '')
         if not block.endswith(b(os.linesep)):
             block += b(os.linesep)
         blocklines = [marker0] + block.splitlines(True) + [marker1]