[lvgl] Fix: allow full range of styles on dropdown list. (#7552)

esphome/components/lvgl/lv_validation.py

@@ -242,6 +242,8 @@ def pixels_or_percent_validator(value):
     """A length in one axis - either a number (pixels) or a percentage"""
     if value == SCHEMA_EXTRACT:
         return ["pixels", "..%"]
+    if isinstance(value, str) and value.lower().endswith("px"):
+        value = cv.int_(value[:-2])
     value = cv.Any(cv.int_, cv.percentage)(value)
     if isinstance(value, int):
         return value

esphome/components/lvgl/widgets/dropdown.py

@@ -6,6 +6,8 @@ from ..defines import (
     CONF_DIR,
     CONF_INDICATOR,
     CONF_MAIN,
+    CONF_SCROLLBAR,
+    CONF_SELECTED,
     CONF_SELECTED_INDEX,
     CONF_SYMBOL,
     DIRECTIONS,
@@ -23,7 +25,9 @@ CONF_DROPDOWN_LIST = "dropdown_list"
 
 lv_dropdown_t = LvSelect("lv_dropdown_t")
 lv_dropdown_list_t = LvType("lv_dropdown_list_t")
-dropdown_list_spec = WidgetType(CONF_DROPDOWN_LIST, lv_dropdown_list_t, (CONF_MAIN,))
+dropdown_list_spec = WidgetType(
+    CONF_DROPDOWN_LIST, lv_dropdown_list_t, (CONF_MAIN, CONF_SELECTED, CONF_SCROLLBAR)
+)
 
 DROPDOWN_BASE_SCHEMA = cv.Schema(
     {

esphome/components/lvgl/widgets/meter.py

@@ -309,6 +309,6 @@ async def set_indicator_values(meter, indicator, config):
             lv.meter_set_indicator_start_value(meter, indicator, start_value)
     if end_value is not None:
         lv.meter_set_indicator_end_value(meter, indicator, end_value)
-    if opa := config.get(CONF_OPA):
+    if (opa := config.get(CONF_OPA)) is not None:
         lv_assign(indicator.opa, await opacity.process(opa))
         lv_obj.invalidate(meter)