Tmp store.

Runtime/cupertino/theme.cs

         }
 
         public CupertinoThemeData copyWith(
-            Brightness? brightness,
-            Color primaryColor,
-            Color primaryContrastingColor,
-            CupertinoTextThemeData textTheme,
-            Color barBackgroundColor,
-            Color scaffoldBackgroundColor
+            Brightness? brightness = null,
+            Color primaryColor = null,
+            Color primaryContrastingColor = null,
+            CupertinoTextThemeData textTheme = null,
+            Color barBackgroundColor = null,
+            Color scaffoldBackgroundColor = null
         ) {
             return new CupertinoThemeData(
                 brightness: brightness ?? this._brightness,

Runtime/cupertino/nav_bar.cs.meta

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