? why do we care if it's None

system/ui/lib/widget.py

@@ -2,7 +2,7 @@ import abc
 import pyray as rl
 from enum import IntEnum
 from collections.abc import Callable
-from typing import TypeVar, cast
+from typing import TypeVar
 
 
 class DialogResult(IntEnum):
@@ -14,10 +14,8 @@ class DialogResult(IntEnum):
 T = TypeVar("T")
 
 
-def _resolve_value(value: T | Callable[[], T], default: T | str = "") -> T:
-  if callable(value):
-    return value()
-  return value if value is not None else cast(T, default)
+def _resolve_value(value: T | Callable[[], T]) -> T:
+  return value() if callable(value) else value
 
 
 class Widget(abc.ABC):
@@ -28,7 +26,7 @@ class Widget(abc.ABC):
 
   @property
   def is_visible(self) -> bool:
-    return _resolve_value(self._is_visible, True)
+    return _resolve_value(self._is_visible)
 
   def set_visible(self, visible: bool | Callable[[], bool]) -> None:
     self._is_visible = visible