Use checkmark to indicate selected language, ensure initial scroll displays it

src/seedsigner/gui/screens/screen.py

@@ -1,3 +1,4 @@
+import math
 import logging
 import time
 
@@ -296,7 +297,8 @@ class ButtonListScreen(BaseTopNavScreen):
     Button_cls = Button
     checked_buttons: List[int] = None
 
-    # Enables returning w/buttons rendered at the same place
+    # Enables returning w/buttons rendered at the same place; default behavior will
+    # ensure the screen is at least scrolled to reveal the `selected_button`.
     scroll_y_initial_offset: int = None
 
 
@@ -324,6 +326,15 @@ class ButtonListScreen(BaseTopNavScreen):
             button_list_y = self.top_nav.height
             self.has_scroll_arrows = True
 
+        # How many buttons fit on the screen before we need to start scrolling?
+        num_buttons_pre_scroll = math.floor((self.canvas_height - button_list_y - GUIConstants.EDGE_PADDING) / (button_height + GUIConstants.LIST_ITEM_PADDING))
+
+        # Force a scroll offset when necessary if none was provided
+        if self.selected_button + 1 > num_buttons_pre_scroll and not self.scroll_y_initial_offset:
+            # Scroll far enough to expose the selected button; +1 to account for the
+            # height of the target button itself!
+            self.scroll_y_initial_offset = (button_height + GUIConstants.LIST_ITEM_PADDING) * (self.selected_button - num_buttons_pre_scroll + 1)
+
         self.buttons: List[Button] = []
         for i, button_option in enumerate(self.button_data):
             if type(button_option) != ButtonOption:

src/seedsigner/gui/screens/settings_screens.py

@@ -21,7 +21,6 @@ class SettingsEntryUpdateSelectionScreen(ButtonListScreen):
     help_text: str = None
     checked_buttons: List[int] = None
     settings_entry_type: str = SettingsConstants.TYPE__ENABLED_DISABLED
-    selected_button: int = 0
 
     def __post_init__(self):
         self.title = _("Settings")

src/seedsigner/views/settings_views.py

@@ -99,8 +99,11 @@ class SettingsMenuView(View):
 
 class LocaleSelectionView(View):
     def run(self):
+        cur_language_code = self.settings.get_value(SettingsConstants.SETTING__LOCALE)
+
+        selected_button = 0
         button_data: list[ButtonOption] = []
-        for language_code, display_name in SettingsConstants.get_detected_languages():
+        for i, (language_code, display_name) in enumerate(SettingsConstants.get_detected_languages()):
             button_data.append(
                 # Unique to this View: override each button's font so we can display each
                 # language name in its native script.
@@ -112,11 +115,16 @@ class LocaleSelectionView(View):
                 )
             )
 
+            if language_code == cur_language_code:
+                # Highlight the current selection
+                selected_button = i
+
         selected_menu_num = self.run_screen(
-            ButtonListScreen,
+            settings_screens.SettingsEntryUpdateSelectionScreen,
+            display_name=_(SettingsDefinition.get_settings_entry(attr_name=SettingsConstants.SETTING__LOCALE).display_name),
             button_data=button_data,
-            title=_(SettingsDefinition.get_settings_entry(attr_name=SettingsConstants.SETTING__LOCALE).display_name),
-            is_button_text_centered=False,
+            selected_button=selected_button,
+            checked_buttons=[selected_button],
         )
 
         if selected_menu_num == RET_CODE__BACK_BUTTON: