Fix long lines being wrapped with a trailing space (#4282)

.github/workflows/tox.yml

@@ -72,7 +72,7 @@ jobs:
     env:
       # Number of expected test passes, safety measure for accidental skip of
       # tests. Update value if you add/remove tests.
-      PYTEST_REQPASS: 888
+      PYTEST_REQPASS: 889
     steps:
       - uses: actions/checkout@v4
         with:

src/ansiblelint/yaml_utils.py

@@ -1217,6 +1217,10 @@ def _post_process_yaml(
                     lines[index] = spaces + comment
                 full_line_comments.clear()
 
+            if line.rpartition(" ")[2] == "\n":
+                # drop any trailing spaces
+                lines[i] = line.rstrip() + "\n"
+
             cleaned = line.strip()
             if not cleaned.startswith("#") and cleaned.endswith("-"):
                 # got an empty list item. drop any trailing spaces.

test/test_yaml_utils.py

@@ -249,6 +249,12 @@ def load_yaml_formatting_fixtures(fixture_filename: str) -> tuple[str, str, str]
             None,
             id="12",
         ),
+        pytest.param(
+            "---\nWSLENV: HOSTNAME:CI:FORCE_COLOR:GITHUB_ACTION:GITHUB_ACTION_PATH/p:GITHUB_ACTION_REPOSITORY:GITHUB_WORKFLOW:GITHUB_WORKSPACE/p:GITHUB_PATH/p:GITHUB_ENV/p:VIRTUAL_ENV/p:SKIP_PODMAN:SKIP_DOCKER\n",
+            "---\nWSLENV:\n  HOSTNAME:CI:FORCE_COLOR:GITHUB_ACTION:GITHUB_ACTION_PATH/p:GITHUB_ACTION_REPOSITORY:GITHUB_WORKFLOW:GITHUB_WORKSPACE/p:GITHUB_PATH/p:GITHUB_ENV/p:VIRTUAL_ENV/p:SKIP_PODMAN:SKIP_DOCKER\n",
+            None,
+            id="13",
+        ),
     ),
 )
 def test_fmt(before: str, after: str, version: tuple[int, int] | None) -> None: