fix: Cupertino text dialogs

lib/widgets/adaptive_dialogs/dialog_text_field.dart

@@ -64,10 +64,12 @@ class DialogTextField extends StatelessWidget {
         );
       case TargetPlatform.iOS:
       case TargetPlatform.macOS:
+        final placeholder = labelText ?? hintText;
         return Column(
-          mainAxisSize: MainAxisSize.min,
           children: [
-            CupertinoTextField(
+            SizedBox(
+              height: placeholder == null ? null : ((maxLines ?? 1) + 1) * 20,
+              child: CupertinoTextField(
                 controller: controller,
                 obscureText: obscureText,
                 minLines: minLines,
@@ -77,7 +79,8 @@ class DialogTextField extends StatelessWidget {
                 autocorrect: autocorrect,
                 prefix: prefixText != null ? Text(prefixText) : null,
                 suffix: suffixText != null ? Text(suffixText) : null,
-              placeholder: labelText ?? hintText,
+                placeholder: placeholder,
+              ),
             ),
             if (errorText != null)
               Text(

lib/widgets/adaptive_dialogs/show_text_input_dialog.dart

@@ -34,9 +34,7 @@ Future<String?> showTextInputDialog({
     useRootNavigator: useRootNavigator,
     builder: (context) {
       final error = ValueNotifier<String?>(null);
-      return ConstrainedBox(
+      return AlertDialog.adaptive(
-        constraints: const BoxConstraints(maxWidth: 512),
-        child: AlertDialog.adaptive(
         title: ConstrainedBox(
           constraints: const BoxConstraints(maxWidth: 256),
           child: Text(title),
@@ -103,7 +101,6 @@ Future<String?> showTextInputDialog({
             ),
           ),
         ],
-        ),
       );
     },
   );