fix: 3-alpine

Author: e3rd

docs/Changelog.md

@@ -5,6 +5,7 @@
 * enh (run): settings accepts subclasses (-> shorter notation)
 * enh: [CliSettings][mininterface.settings.CliSettings]
 * fix: Countdown won't stop on Alt+Tab.
+* fix: 3-alpine
 
 ## 1.1.2 (2025-10-01)
 * feat: timeout parameter for alert & confirm

mininterface/_mininterface/__init__.py

@@ -90,7 +90,15 @@ class Env:
         # NOTE docs that
         # m = run([Env, Env2]) -> .env will be the chosen one.
 
-        self._adaptor = self.__annotations__["_adaptor"](self, settings)
+        # Why using `type(self)` instead of `self.__annotations__`?
+        # Always access annotations via the class, not the instance.
+        # Some mixins or Generic from typing may prevent instances from having __annotations__.
+        # Using type(self).__annotations__ ensures compatibility across Python versions and platforms.
+        #
+        # Example: on Alpine Python 3-alpine image, accessing self.__annotations__ raised AttributeError.
+        # Hypothesis: the combination of typing.Generic + musl libc build altered the metaclass behavior,
+        # causing __annotations__ to not be automatically set on the instance.
+        self._adaptor = type(self).__annotations__["_adaptor"](self, settings)
 
     def __enter__(self) -> "Self":
         """Usage within the with statement makes the program to attempt for the following benefits:

mininterface/_tk_interface/utils.py

@@ -165,7 +165,8 @@ def prevent_submit(event):
         # Only prevent form submission, don't affect Tab navigation
         return None  # Allow event propagation for other handlers
 
-    for tag, field_form in zip(flatten(form), flatten(nested_widgets)):
+    fform = list(flatten(form))
+    for tag, field_form in zip(fform, flatten(nested_widgets)):
         tag: Tag
         field_form: FieldForm
         label1: Widget = field_form.label
@@ -193,8 +194,7 @@ def prevent_submit(event):
         match tag:
             case SelectTag():
                 grid_info = widget.grid_info()
-                single = len(dict_removed_main(form)) == 1
-                wrapper = SelectInputWrapper(master, tag, grid_info, widget, adaptor, single)
+                wrapper = SelectInputWrapper(master, tag, grid_info, widget, adaptor, len(fform) == 1)
                 select_tag = True
                 variable = wrapper.variable_wrapper
                 # since tkinter variables do not allow objects,