Fix: Add newline before super tables when rendering

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Preserve the newlines before super tables when rendering. ([#178](https://github.com/sdispater/tomlkit/issues/178))
+
 ## [0.10.0] - 2022-02-18
 
 ### Fixed

tests/test_toml_document.py

@@ -12,6 +12,7 @@
 from tomlkit import parse
 from tomlkit import ws
 from tomlkit._utils import _utc
+from tomlkit.api import document
 from tomlkit.exceptions import NonExistentKey
 
 
@@ -927,3 +928,18 @@ def test_pop_add_whitespace_and_insert_table_work_togheter():
     assert out["d"] == 4
     assert "d" not in out["e"]
     assert text == dedent(expected)
+
+
+def test_add_newline_before_super_table():
+    doc = document()
+    doc["a"] = 1
+    doc["b"] = {"c": {}}
+    doc["d"] = {"e": {}}
+    expected = """\
+    a = 1
+
+    [b.c]
+
+    [d.e]
+    """
+    assert doc.as_string() == dedent(expected)

tomlkit/container.py

@@ -505,6 +505,8 @@ def _render_table(
                 table.trivia.trail,
                 "\n" if "\n" not in table.trivia.trail and len(table.value) > 0 else "",
             )
+        elif table.trivia.indent == "\n":
+            cur += table.trivia.indent
 
         for k, v in table.value.body:
             if isinstance(v, Table):