fix: rename fields for custom error to conform with Flutter form naming

Author: danvick

lib/src/form_builder_field.dart

@@ -83,7 +83,7 @@ class FormBuilderField<T> extends FormField<T?> {
 
 class FormBuilderFieldState<F extends FormBuilderField<T?>, T>
     extends FormFieldState<T?> {
-  String? _customError;
+  String? _customErrorText;
 
   @override
   F get widget => super.widget as F;
@@ -176,9 +176,7 @@ class FormBuilderFieldState<F extends FormBuilderField<T?>, T>
 
   @override
   bool validate() {
-    setState(() {
-      _customError = null;
-    });
+    setState(() => _customErrorText = null);
     return super.validate() && widget.decoration.errorText == null;
   }
 
@@ -187,15 +185,13 @@ class FormBuilderFieldState<F extends FormBuilderField<T?>, T>
     Scrollable.ensureVisible(context);
   }
 
-  void invalidateField(String reason) {
+  void invalidate(String reason) {
+    setState(() => _customErrorText = reason);
     requestFocus();
-    setState(() {
-      _customError = reason;
-    });
   }
 
   //  FIXME: This  could be a getter instead of a classic function
   InputDecoration decoration() => widget.decoration.copyWith(
-      errorText: widget.decoration.errorText ?? errorText ?? _customError,
+      errorText: widget.decoration.errorText ?? errorText ?? _customErrorText,
     );
 }

lib/src/utils/extension.dart

@@ -2,12 +2,9 @@ import 'package:flutter/widgets.dart';
 import 'package:flutter_form_builder/flutter_form_builder.dart';
 
 extension FormKey on GlobalKey<FormBuilderState> {
-  void invalidateField({
-    required String name,
-    String? reason,
-  }) =>
-      currentState?.fields[name]?.invalidateField(reason ?? '');
+  void invalidateField({required String name, String? errorText}) =>
+      currentState?.fields[name]?.invalidate(errorText ?? '');
 
-  void invalidateFirstField({required String reason}) =>
-      currentState?.fields.values.first.invalidateField(reason);
-}
+  void invalidateFirstField({required String errorText}) =>
+      currentState?.fields.values.first.invalidate(errorText);
+}