[core] Pass a single condition to actions directly instead of wrapping it in a group (#19223)

tests/component_tests/automation/config/condition_groups.yaml

@@ -0,0 +1,44 @@
+---
+esphome:
+  name: test
+
+esp32:
+  board: nodemcu-32s
+
+logger:
+
+binary_sensor:
+  - platform: template
+    id: single_and
+    on_press:
+      - if:
+          condition:
+            - lambda: return true;
+          then:
+            - logger.log: single and
+  - platform: template
+    id: single_or
+    on_press:
+      - if:
+          any:
+            - lambda: return true;
+          then:
+            - logger.log: single or
+  - platform: template
+    id: double_and
+    on_press:
+      - if:
+          condition:
+            - lambda: return true;
+            - lambda: return false;
+          then:
+            - logger.log: double and
+  - platform: template
+    id: single_xor
+    on_press:
+      - if:
+          condition:
+            xor:
+              - lambda: return true;
+          then:
+            - logger.log: single xor

tests/component_tests/automation/test_condition_groups.py

@@ -0,0 +1,25 @@
+"""Tests for and/or condition group codegen."""
+
+from collections.abc import Callable
+from pathlib import Path
+import re
+
+
+def test_single_condition_groups_are_unwrapped(
+    generate_main: Callable[[str | Path], str],
+    component_config_path: Callable[[str], Path],
+) -> None:
+    """A group of one condition is passed to the action directly."""
+    main_cpp = generate_main(component_config_path("condition_groups.yaml"))
+
+    assert "IfAction<false>(lambdacondition_id);" in main_cpp
+    assert "IfAction<false>(lambdacondition_id_2);" in main_cpp
+    group = re.search(
+        r"new\((\w+)\) AndCondition<2>\(\{lambdacondition_id_3, lambdacondition_id_4\}\);",
+        main_cpp,
+    )
+    assert group is not None
+    assert f"IfAction<false>({group.group(1)});" in main_cpp
+    # xor of one condition equals that condition, so it is unwrapped too.
+    assert "IfAction<false>(lambdacondition_id_5);" in main_cpp
+    assert "XorCondition<" not in main_cpp