[core] Fix for missing arguments to shared_lambda (#12115)

esphome/components/lvgl/widgets/__init__.py

@@ -382,7 +382,7 @@ async def set_obj_properties(w: Widget, config):
         clrs = join_enums(flag_clr, "LV_OBJ_FLAG_")
         w.clear_flag(clrs)
     for key, value in lambs.items():
-        lamb = await cg.process_lambda(value, [], return_type=cg.bool_)
+        lamb = await cg.process_lambda(value, [], capture="=", return_type=cg.bool_)
         flag = f"LV_OBJ_FLAG_{key.upper()}"
         with LvConditional(call_lambda(lamb)) as cond:
             w.add_flag(flag)
@@ -407,7 +407,7 @@ async def set_obj_properties(w: Widget, config):
             clears = join_enums(clears, "LV_STATE_")
             w.clear_state(clears)
         for key, value in lambs.items():
-            lamb = await cg.process_lambda(value, [], return_type=cg.bool_)
+            lamb = await cg.process_lambda(value, [], capture="=", return_type=cg.bool_)
             state = f"LV_STATE_{key.upper()}"
             with LvConditional(call_lambda(lamb)) as cond:
                 w.add_state(state)

esphome/cpp_generator.py

@@ -659,7 +659,7 @@ async def get_variable_with_full_id(id_: ID) -> tuple[ID, "MockObj"]:
 async def process_lambda(
     value: Lambda,
     parameters: TemplateArgsType,
-    capture: str = "=",
+    capture: str = "",
     return_type: SafeExpType = None,
 ) -> LambdaExpression | None:
     """Process the given lambda value into a LambdaExpression.
@@ -702,12 +702,6 @@ async def process_lambda(
             parts[i * 3 + 1] = var
         parts[i * 3 + 2] = ""
 
-    # All id() references are global variables in generated C++ code.
-    # Global variables should not be captured - they're accessible everywhere.
-    # Use empty capture instead of capture-by-value.
-    if capture == "=":
-        capture = ""
-
     if isinstance(value, ESPHomeDataBase) and value.esp_range is not None:
         location = value.esp_range.start_mark
         location.line += value.content_offset

tests/components/lvgl/lvgl-package.yaml

@@ -16,6 +16,18 @@ binary_sensor:
     platform: template
   - id: left_sensor
     platform: template
+  - platform: lvgl
+    id: button_checker
+    name: LVGL button
+    widget: button_button
+    on_state:
+      then:
+        - lvgl.checkbox.update:
+            id: checkbox_id
+            state:
+              checked: !lambda |-
+                  auto y = x; // block inlining of one line return
+                  return y;
 
 lvgl:
   log_level: debug